Definition
To fulfill all promises made to someone.
信守承諾；言出必行。
She promised to send me a postcard, and she was as good as her word.
她答應寄明信片給我，而且她言出必行。
He guaranteed that he would finish the report on time, and he was as good as his word.
他保證會準時完成報告，而且他言出必行。
They pledged to provide assistance, and they were as good as their word.
他們承諾提供協助，而且他們言出必行。