To hear (speech or someone speaking) without the speaker's awareness or intent.
To hear something without the speaker's awareness or intent.
To hear (something spoken or a speaker) without the speaker's knowledge or intention.
Origin of overhear
From Middle English *overheren, from Old English oferhÄ«eran (“to overhear, hear, disobey, disregard, neglect"), equivalent to over- +"Ž hear. Cognate with Dutch overhoren (“to hear, hear about"), German Ã¼berhÃ¶ren (“to not hear, ignore"), Danish overhÃ¸re (“to overhear"), Icelandic yfirheyra (“to hear").