noun, takes する, transitive verb, intransitive verb

  1. verbal promise, one's word.

Variations

Pronunciation Kanji Kana Is Common
口約束 くちやくそく

Contained Kanji Breakdown

mouth
くち コウ ク (1st, N4)
promise, approximately, shrink
ヤク つづ.まる つづま.やか (4th, N3)
thread
いと シ (1st, N2)
short thread radical (no. 52)
ヨウ ちいさい (Kentei 1)
little, small
ショウ こ- ちい.さい (1st, N5)
feathered stick, barb radical (no. 6)
ケツ かぎ (Kentei 1)
eight, eight radical (no. 12)
ハチ や はっ (1st, N5)
ladle, one tenth of a go, dip
シャク (N1)
wrapping enclosure, wrapping radical (no. 20)
ホウ つつ.む (Kentei 1)
dot, tick or dot radical (no. 3)
チュ (Kentei 1)
bundle, sheaf, ream
ソク たば つか (4th, N3)
tree, wood
き モク こ- (1st, N5)
mouth
くち コウ ク (1st, N4)