“拾人牙慧”是一个汉语成语，比喻拾取别人的一言半语当作自己的话（pick up phrases from somebody and pass them off as one's own），也比喻窃取别人的语言和文字（steal others' ideas/sayings）,带有贬义。

例句：

他只是鹦鹉学舌，拾人牙慧罢了！

He talks like a parrot and just repeat what he heard.

他那篇文章尽是拾人牙慧的观念。

His article is full of hand-me-down concepts.