4 3 2 1
(also four three two one) uk
/ˌfɔː θriː tuː ˈwʌn/ us
/ˌfɔːr θriː tuːˈwʌn/Meaning of 4 3 2 1 in English
(Definition of 4 3 2 1 from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)