Tom CollinsPronunciation: /tɒmˈkɒlɪnz/Definition of Tom Collins noun a cocktail made from gin mixed with soda, sugar, and lemon or lime juice: [count noun]:the tuxedoed ushers carried trays of martinis and Tom CollinsesOrigin:sometimes said to have been named after a 19th-century London bartenderTom Collins in other Oxford dictionaries Definition of Tom Collins in the US English dictionary