noun, takes する

  1. opening, aperture (e.g. camera).
  2. opening one's mouth, beginning to speak.

noun or verb acting predominately

  1. open, broad.

Variations

Pronunciation Kanji Kana Is Common
開口 かいこう

Contained Kanji Breakdown

open, unfold, unseal
カイ ひら.く あ.く (3rd, N4)
gate, counter for cannons
モン かど と (2nd, N2)
open, initiate, begin
one, one radical (no.1)
イチ いっ ひと- (1st, N5)
twenty, twenty or letter H radical (no. 55)
キョウ ク にじゅう (Kentei 1)
mouth
くち コウ ク (1st, N4)