The region or line along which opposing armies engage in combat.
The area in which opponents or opposing ideas meet.
Organized, large-scale, armed conflict between countries or between national, ethnic, or other sizeable groups, usually but not always involving active engagement of military forces.
A particular conflict of this kind.
A prolonged conflict between two groups of organized criminals, usually over organizational or territorial control.
Any of a family of card games where all cards are dealt at the beginning of play and players attempt to capture them all, typically involving no skill and only serving to kill time.
An argument between two or more people with opposing opinions on a topic or issue.
Protracted armed conflict against irregular forces, particularly groups considered terrorists.
A protracted instance of fierce competition in trade.
Campaigns against various social problems.
To carry on, as a contest; to wage.
To engage in conflict (may be followed by "with" to specify the foe).