"applier" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "apply",
        "3": "er",
        "id2": "agent noun"
      },
      "expansion": "apply + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "apply + -er",
  "forms": [
    {
      "form": "appliers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "applier (plural appliers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -er (agent noun)",
          "parents": [],
          "source": "w"
        },
        {
          "_dis": "91 4 5",
          "kind": "other",
          "name": "Old French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "84 8 8",
          "kind": "other",
          "name": "Old French verbs ending in -er",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "85 7 8",
          "kind": "other",
          "name": "Old French verbs with weak-a preterite",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A person or device that applies something."
      ],
      "id": "en-applier-en-noun-v1Ath6E3",
      "links": [
        [
          "applies",
          "applies"
        ]
      ]
    }
  ],
  "word": "applier"
}

{
  "categories": [
    "Old French entries with incorrect language header",
    "Old French first group verbs",
    "Old French lemmas",
    "Old French terms derived from Latin",
    "Old French terms inherited from Latin",
    "Old French verbs",
    "Old French verbs ending in -er",
    "Old French verbs with weak-a preterite"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "apply",
        "3": "er",
        "id2": "agent noun"
      },
      "expansion": "apply + -er",
      "name": "suffix"
    }
  ],
  "etymology_text": "apply + -er",
  "forms": [
    {
      "form": "appliers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "applier (plural appliers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms suffixed with -er (agent noun)"
      ],
      "glosses": [
        "A person or device that applies something."
      ],
      "links": [
        [
          "applies",
          "applies"
        ]
      ]
    }
  ],
  "word": "applier"
}