noun

a light blow or a jolting collision.

a nasty bump on the head

jolt,collision,crash,smash,smack,crack,thwack,bang,thud,thump,buffet,knock,rap,tap,impact,whack,bash,wallop

verb

knock or run into someone or something with a jolt.

I almost bumped into him

hit,ram,bang (into),collide with,be in collision with,strike,knock (into),knock against,crash into/against,smash into,slam into,crack into/against,dash against,run into,plough into,impact