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To collide or strike: Sound waves impinge on the eardrum.
(verb-intransitive)
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To encroach; trespass: Do not impinge on my privacy.
(verb-intransitive)
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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).
(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.