"aĉ" meaning in Esperanto

{
  "etymology_templates": [
    {
      "args": {
        "1": "eo",
        "2": "-aĉ-"
      },
      "expansion": "Back-formation from -aĉ-",
      "name": "back-form"
    }
  ],
  "etymology_text": "Back-formation from -aĉ-.",
  "hyphenation": [
    "aĉ"
  ],
  "lang": "Esperanto",
  "lang_code": "eo",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Esperanto back-formations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Esperanto entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "Good God! What is that stench?",
          "text": "Aĉ! Kio estas tiu fetoro?",
          "type": "example"
        },
        {
          "english": "Uh-oh! You're in for it!",
          "text": "Aĉ! Vi malfeliĉiĝos!",
          "type": "example"
        },
        {
          "english": "We're having a pop quiz?? Oh no!",
          "text": "Ĉu ni havos neatenditan ekzameneton?? Aĉ!",
          "type": "example"
        },
        {
          "english": "Ugh, what am I supposed to do now?",
          "text": "Aĉ, kion mi devas fari nun?",
          "type": "example"
        }
      ],
      "glosses": [
        "Used to express dismay at a bad or unfortunate situation. Translations vary according to context, and may include uh-oh, ugh, oh no, my goodness, yuck, and too bad, among others."
      ],
      "id": "en-aĉ-eo-intj-lugshGJ0",
      "links": [
        [
          "uh-oh",
          "uh-oh#English"
        ],
        [
          "ugh",
          "ugh#English"
        ],
        [
          "oh no",
          "oh no#English"
        ],
        [
          "my goodness",
          "my goodness#English"
        ],
        [
          "yuck",
          "yuck#English"
        ],
        [
          "too bad",
          "too bad#English"
        ]
      ],
      "related": [
        {
          "word": "ve"
        }
      ]
    }
  ],
  "sounds": [
    {
      "audio": "LL-Q143 (epo)-Lepticed7-aĉ.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/1e/LL-Q143_%28epo%29-Lepticed7-a%C4%89.wav/LL-Q143_%28epo%29-Lepticed7-a%C4%89.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/1e/LL-Q143_%28epo%29-Lepticed7-a%C4%89.wav/LL-Q143_%28epo%29-Lepticed7-a%C4%89.wav.ogg"
    },
    {
      "ipa": "[at͡ʃ]"
    }
  ],
  "word": "aĉ"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "eo",
        "2": "-aĉ-"
      },
      "expansion": "Back-formation from -aĉ-",
      "name": "back-form"
    }
  ],
  "etymology_text": "Back-formation from -aĉ-.",
  "hyphenation": [
    "aĉ"
  ],
  "lang": "Esperanto",
  "lang_code": "eo",
  "pos": "intj",
  "related": [
    {
      "word": "ve"
    }
  ],
  "senses": [
    {
      "categories": [
        "Esperanto back-formations",
        "Esperanto entries with incorrect language header",
        "Esperanto interjections",
        "Esperanto lemmas",
        "Esperanto terms with IPA pronunciation",
        "Esperanto terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "english": "Good God! What is that stench?",
          "text": "Aĉ! Kio estas tiu fetoro?",
          "type": "example"
        },
        {
          "english": "Uh-oh! You're in for it!",
          "text": "Aĉ! Vi malfeliĉiĝos!",
          "type": "example"
        },
        {
          "english": "We're having a pop quiz?? Oh no!",
          "text": "Ĉu ni havos neatenditan ekzameneton?? Aĉ!",
          "type": "example"
        },
        {
          "english": "Ugh, what am I supposed to do now?",
          "text": "Aĉ, kion mi devas fari nun?",
          "type": "example"
        }
      ],
      "glosses": [
        "Used to express dismay at a bad or unfortunate situation. Translations vary according to context, and may include uh-oh, ugh, oh no, my goodness, yuck, and too bad, among others."
      ],
      "links": [
        [
          "uh-oh",
          "uh-oh#English"
        ],
        [
          "ugh",
          "ugh#English"
        ],
        [
          "oh no",
          "oh no#English"
        ],
        [
          "my goodness",
          "my goodness#English"
        ],
        [
          "yuck",
          "yuck#English"
        ],
        [
          "too bad",
          "too bad#English"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "audio": "LL-Q143 (epo)-Lepticed7-aĉ.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/1e/LL-Q143_%28epo%29-Lepticed7-a%C4%89.wav/LL-Q143_%28epo%29-Lepticed7-a%C4%89.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/1/1e/LL-Q143_%28epo%29-Lepticed7-a%C4%89.wav/LL-Q143_%28epo%29-Lepticed7-a%C4%89.wav.ogg"
    },
    {
      "ipa": "[at͡ʃ]"
    }
  ],
  "word": "aĉ"
}