off base

错误的, 冷不防地

例句与用法：

His idea is completely off base.

他的想法大错特错。

He caught me off base with that question.

他的问题猝然把我给问倒了。

You're a bit off base there.

你在那个地方有点不对头。

Her reply caught him off base.

她的答覆使他不知所措。