one–shot

happening only once <this offer is a one-shot deal; if you refuse, you won't get another chance> Synonyms one-off, one-shotRelated Words nonce; inconstant, infrequent, intermittent, irregular, occasionalNear Antonyms common, commonplace, everyday, familiar, ordinary, routine, ubiquitous, usual; cyclic (or cyclical); around-the-clock, constant, continual, hourly, round-the-clock; accustomed, chronic, confirmed, customary, habitual, inveterate; expected; annual, yearlyAntonyms frequent, periodic, periodical, recurrent, recurring, regular, repeated, steady