Webster's English Dictionary

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impinge

im.pinge \im-'pinj\ \-m*nt\ vb [L impingere, fr. in- + pangere to fasten, 
   drive in - more]at PACT 1: to strike or dash esp. with a sharp collision  
   2: to come into close contact  3: ENCROACH, INFRINGE  : to cause (as a gas 
   or a flame) to strike  - im.pinge.ment n