Real Dictionary

kung fu
uncountable noun: Kung fu is a Chinese way of fighting in which people use only their bare hands and feet.

kung fu in American English
a Chinese system of self-defense, like karate but emphasizing circular rather than linear movements
noun: an ancient Chinese method of self-defense by striking blows at vulnerable areas of an attacker's body using fluid movements of the hands and legs

kung fu in British English
noun: any of various Chinese martial arts, some focusing on unarmed combat, others involving the use of weapons