o·ver·hear

[oh-ver-heer]
verb (used with object), o·ver·heard, o·ver·hear·ing.
to hear (speech or a speaker) without the speaker's intention or knowledge: I accidentally overheard what they were saying.

Origin:
1540–50; over- + hear

o·ver·hear·er, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
overhear (ˌəʊvəˈhɪə) [Click for IPA pronunciation guide]
 
vb , -hears, -hearing, -heard
(tr) to hear (a person, remark, etc) without the knowledge of the speaker

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Overheard is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
Etymonline
Word Origin & History

overhear
"to hear what one is not meant to hear," 1549, from over + hear (q.v.). The notion is perhaps "to hear beyond the intended range of the voice." O.E. oferhieran meant "to not listen, to disregard, disobey" (cf. overlook, and M.H.G. überhaeren, M.Du. overhoren in same sense).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If you've ever overheard people brag about their free rooms, cheap show tickets
  and free slot.
Of course, the potential targets should not be overheard speaking or otherwise
  be too obvious.
Anyone who could have overheard them would have laughed at them, but they were
  serious.
Talk story where writer quotes various people he's overheard in the course of
  forty-five minutes one morning.
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