his word; his promise
Wäre sein Wort eine Brücke, ich ginge nicht darüber.
If his word were a bridge, I would not cross it.
He gave her his word.
Alle Schüler vertrauen Herrn Akai, weil er nie sein Wort bricht.
All students trust Mr. Akai because he never breaks his word.
Soweit ich weiß, hält er immer sein Wort.
As far as I know, he always keeps his word.