Real Dictionary

sport
countable noun: If you say that someone is a sport or a good sport, you mean that they cope with a difficult situation or teasing in a cheerful way.
variable noun: Sports are games such as football and basketball and other competitive leisure activities which need physical effort and skill.

sport in American English
adjective: of, pertaining to, or used in sports or a particular sport
intransitive verb: to amuse oneself with some pleasant pastime or recreation
noun: an athletic activity requiring skill or physical prowess and often of a competitive nature, as racing, baseball, tennis, golf, bowling, wrestling, boxing, hunting, fishing, etc
transitive verb: to pass (time) in amusement or sport

sport in British English
noun: an individual or group activity pursued for exercise or pleasure, often involving the testing of physical capabilities and taking the form of a competitive game such as football, tennis, etc
verb: to wear or display in an ostentatious or proud manner