noun.
Someone who attacks or assails another violently, or criminally; an attacker.
noun.
A hostilecritic or opponent.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
someone who attacks
Word Usage
"UPDATE 3 - I see from the Englishman that the Royal Marine who got kicked in the head during their attempt to win the Turner prize has said his assailant is a 'good mate'."