Real Dictionary

dart
countable noun: A dart is a small, narrow object with a sharp point which can be thrown or shot.
uncountable noun: Darts is a game in which you throw darts at a round board which has numbers on it.
verb: If a person or animal darts somewhere, they move there suddenly and quickly.
verb: If you dart a look at someone or something, or if your eyes dart to them, you look at them very quickly.

dart in American English
a small, pointed missile, usually with the rear end feathered, used as for throwing at a target in games or for shooting from a blowgun
to throw, shoot, or send out suddenly and fast
intransitive verb: to move swiftly; spring or start suddenly and run swiftly
noun: a small, slender missile that is pointed at one end and usually feathered at the other and is propelled by hand, as in the game of darts, or by a blowgun when used as a weapon
transitive verb: to thrust or move suddenly or rapidly

dart in British English 1
noun: a small narrow pointed missile that is thrown or shot, as in the game of darts
verb: to move or throw swiftly and suddenly; shoot

dart in British English 2
noun: any of various tropical and semitropical marine fish