as true as steel 忠实可靠；绝对可靠

【例句】
He is one of my old friends and is as true as steel whatever happens.
他是我的一个老朋友，在任何情况下都是忠实可靠的。

I warrant thee, my man's as true as steel.
你放心吧，我的仆人是最可靠不过的。