Etymology
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Words related to eavesdropper

eave (n.)
"lower part of a roof," especially that which projects beyond the wall, 1570s, alteration of southwest Midlands dialectal eovese (singular), from Old English efes "edge of a roof," also "edge of a forest," from Proto-Germanic *ubaswo-/*ubiswo "vestibule, porch, eaves" (source also of Old Frisian ose "eaves," Old High German obasa "porch, hall, roof," German Obsen, Old Norse ups, Gothic ubizwa "porch;" German oben "above"), from extended form of PIE root *upo "under," also "up from under," hence also "over." Regarded as plural and a new singular form eave emerged 16c.
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drip (v.)

c. 1300, drippen, "to fall in drops; let fall in drops," from Old English drypan, also dryppan, from Proto-Germanic *drupjanan (source also of Old Norse dreypa, Middle Danish drippe, Dutch druipen, Old High German troufen, German triefen), perhaps from a PIE root *dhreu-. Related to droop and drop. Related: Dripped; dripping.

eavesdrop (v.)
"lurk near a place to hear what is said inside," c. 1600, probably a back-formation from eavesdropper. The original notion is listening from under the eaves of a house. Related: Eavesdropping.
*upo 

Proto-Indo-European root meaning "under," also "up from under," hence "over."

It forms all or part of: above; assume; Aufklarung; eave; eavesdropper; hyphen; hypo-; hypochondria; hypocrisy; hypotenuse; hypothalamus; hypothesis; hypsi-; hypso-; opal; open; oft; often; resuscitate; somber; souffle; source; soutane; souvenir; sub-; subject; sublime; subpoena; substance; subterfuge; subtle; suburb; succeed; succinct; succor; succubus; succumb; sudden; suffer; sufficient; suffix; suffrage; suggestion; summon; supine; supple; supply; support; suppose; surge; suspect; suspend; sustain; up; up-; Upanishad; uproar; valet; varlet; vassal.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit upa "near, under, up to, on," Greek hypo "under," Latin sub "under, below," Gothic iup, Old Norse, Old English upp "up, upward," Hittite up-zi "rises."