Definition
To fulfill all promises made to someone.
信守承诺；言出必行。
She promised to send me a postcard, and she was as good as her word.
她答应寄明信片给我，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.
他保证会准时完成报告，而且他言出必行。
They pledged to provide assistance, and they were as good as their word.
他们承诺提供协助，而且他们言出必行。