"washback" meaning in English

{
  "etymology_number": 1,
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "wash",
        "3": "back"
      },
      "expansion": "wash + back",
      "name": "compound"
    }
  ],
  "etymology_text": "From wash + back.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "washback (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Linguistics",
          "orig": "en:Linguistics",
          "parents": [
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
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          "source": "w"
        },
        {
          "_dis": "96 4",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w+disamb"
        },
        {
          "_dis": "96 4",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "97 3",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "derived": [
        {
          "word": "washback effect"
        }
      ],
      "glosses": [
        "The way that tests affect how learners acquire and use a language."
      ],
      "id": "en-washback-en-noun-MvCzkYL~",
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
        [
          "test",
          "test"
        ],
        [
          "learner",
          "learner"
        ],
        [
          "language",
          "language"
        ]
      ],
      "raw_glosses": [
        "(linguistics) The way that tests affect how learners acquire and use a language."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "word": "washback"
}

{
  "etymology_number": 2,
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "wash",
        "3": "back"
      },
      "expansion": "wash + back",
      "name": "compound"
    }
  ],
  "etymology_text": "From wash + back. See back (“a large shallow vat”).",
  "forms": [
    {
      "form": "washbacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "washback (plural washbacks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A large vessel used for fermentation in a distillery."
      ],
      "id": "en-washback-en-noun-DfKk8lTo",
      "links": [
        [
          "vessel",
          "vessel"
        ],
        [
          "fermentation",
          "fermentation"
        ],
        [
          "distillery",
          "distillery"
        ]
      ]
    }
  ],
  "word": "washback"
}

{
  "categories": [
    "English compound terms",
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English nouns",
    "English uncountable nouns",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "derived": [
    {
      "word": "washback effect"
    }
  ],
  "etymology_number": 1,
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "wash",
        "3": "back"
      },
      "expansion": "wash + back",
      "name": "compound"
    }
  ],
  "etymology_text": "From wash + back.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "washback (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "en:Linguistics"
      ],
      "glosses": [
        "The way that tests affect how learners acquire and use a language."
      ],
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        [
          "linguistics",
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          "test",
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        ],
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          "language",
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        ]
      ],
      "raw_glosses": [
        "(linguistics) The way that tests affect how learners acquire and use a language."
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "word": "washback"
}

{
  "categories": [
    "English compound terms",
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English nouns",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "etymology_number": 2,
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "wash",
        "3": "back"
      },
      "expansion": "wash + back",
      "name": "compound"
    }
  ],
  "etymology_text": "From wash + back. See back (“a large shallow vat”).",
  "forms": [
    {
      "form": "washbacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "washback (plural washbacks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A large vessel used for fermentation in a distillery."
      ],
      "links": [
        [
          "vessel",
          "vessel"
        ],
        [
          "fermentation",
          "fermentation"
        ],
        [
          "distillery",
          "distillery"
        ]
      ]
    }
  ],
  "word": "washback"
}