Synonyms of 'overhear'
hearDictionary, listen to, eavesdrop on
When you hear a sound, you become aware of it through your ears.
I overheard two doctors discussing my case.
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Thesaurus for overhear from the Collins English Thesaurus
If you overhear someone, you hear what they are saying when they are not talking to you and they do not know that you are listening .