口こう約やく

noun, noun or participle which takes 'suru', transitive verb

verbal promise; oral agreement

A promise made by word of mouth, not written down. Often used in contrast to a written contract. Can be used as a noun or with する to mean 'to give one's word'.

• 口こう約やくだけでは不ふ安あんなので、契けい約やく書しょを作さく成せいしましょう。

  A verbal promise alone makes me uneasy, so let's draw up a written contract.

• 彼かれは口こう約やくしたことをすぐに忘わすれてしまった。

  He quickly forgot what he had verbally promised.