확대하다

• Tensing (경음화) — ㄱ ㄷ ㅂ ㅅ ㅈ after a ㄱ ㄷ ㅂ sound become tense (ㄲ ㄸ ㅃ ㅆ ㅉ).

Standard pronunciation of the word on its own. Sounds can shift a little inside a sentence.