Real Dictionary

ruffle
verb: If you ruffle someone's hair, you move your hand backwards and forwards through it as a way of showing your affection towards them.

ruffle in American English 1
to take away the smoothness of; wrinkle; ripple
intransitive verb: to be or become ruffled; undulate; flutter
noun: a break in the smoothness or evenness of some surface; undulation
transitive verb: to destroy the smoothness or evenness of

ruffle in American English 2
a low, continuous beating of a drum, not so loud as a roll
to beat (a drum, etc.) with a ruffle
noun: a low, continuous beating of a drum
transitive verb: to beat (a drum) in this manner

ruffle in British English 1
noun: an irregular or disturbed surface
verb: to make, be, or become irregular or rumpled

ruffle in British English 2
noun: a low continuous drumbeat
verb: to beat (a drum) with a low repetitive beat

ruffle in British English 3
verb: to behave riotously or arrogantly; swagger