Pronunciation: (im-pinj'), [key]
—v., -pinged, -ping•ing.
1. to make an impression; have an effect or impact (usually fol. by on or upon): to impinge upon the imagination; social pressures that impinge upon one's daily life.
2. to encroach; infringe (usually fol. by on or upon): to impinge on another's rights.
3. to strike; dash; collide (usually fol. by on, upon, or against): rays of light impinging on the eye.
Obs.to come into violent contact with.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.