一言为定That's settled then.;A promise is a promise.; count it as settled;It's a deal (whack).; once and for all; shake hands on sth.; take someone at his word; That's a bargain (whack).
一言为定 [词典] That's settled then.; A promise is a promise.; count it as settled; It's a deal [whack].; [例句]一言为定，决不反悔。I give you my word and I'll never go back on it.
