hearsay noun
VERB + HEARSAY be based on, rely on Her judgements are based on hearsay rather than evidence.
HEARSAY + NOUN evidence
PREP. by ~ She discovered a world of parties and pleasure she had hitherto only known by hearsay. | from ~ They started to piece the story together from hearsay.
You can also check other dicts: hearsay (English, 中文解释 ), wordnet sense, Collins Definition