intransitive verb impinged -·pinged′, impinging -·ping′·ing

1. 1. to strike, hit, or dash (on, upon, or against something)
   2. to touch (on or upon); have an effect an idea that impinges on one's mind
2. to make inroads or encroach (on or upon the property or rights of another)

Etymology: L impingere < in-, in + pangere, to strike: see fang