Simple past tense and past participle of overhear.(verb)
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Use "overheard" in a sentence
"But occasionally words and phrases come up so often in overheard conversations that they seep through."
"The second piece, Bach's motet, was ... a bit ragged in singing (and so I also overheard from a few people who thought the same)."
"After my relating an experience from over the week-end, Kate and Deborah suggested that we should have a competition for the most outlandish thing overheard from a fellow audience member over the course of the next season."