from The American Heritage® Dictionary of the English Language, 4th Edition
- intransitive v. To collide or strike: Sound waves impinge on the eardrum.
- intransitive v. To encroach; trespass: Do not impinge on my privacy.
- transitive v. To encroach upon: "One of a democratic government's continuing challenges is finding a way to protect . . . secrets without impinging the liberties that democracy exists to protect” ( Christian Science Monitor).
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To make a physical impact (on); to collide, to crash (upon).
- v. To interfere with; to encroach (on, upon).
- v. To have an effect upon; to limit.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To fall or dash against; to touch upon; to strike; to hit; to clash with; -- with on or upon.
from The Century Dictionary and Cyclopedia
- To come in collision; collide; strike or dash: followed by on, upon, or against.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. advance beyond the usual limit
- v. impinge or infringe upon
Latin impingere : in-, against; see in-2 + pangere, to fasten; see pag- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin impingō ("dash against, impinge"). (Wiktionary)