noun, informal - doing something to someone because they did the same thing to you
noun, formal - something that is an unfair or unreasonable burden or inconvenience to someone
noun - the act of forcing people to accept something such as a rule, law, tax, or belief
verb, British English, informal - to spit
verb - to make someone unable to feel pain, usually by giving them drugs before a medical operation
noun - a doctor or specially trained nurse who gives people anaesthetics before and during medical operations
noun - a state in which someone cannot feel pain, usually because of drugs given before a medical operation or procedure