impact

[1]	strike , hit , collide with
[2]	affect , modify , change
[3]	affect , bear upon , bear on , touch on , touch

[1]	collision , contact , striking , crash , smash , bump , colliding , crashing , smashing , bumping
[2]	effect , wallop , impression , influence , import , meaning , bearing , force , thrust , weight , burden , brunt , repercussions , results , consequences
[3]	impingement , encroachment
[4]	shock