Definition of phase verb from the Oxford Advanced Learner's Dictionary

  

phase

 verb
verb
BrE BrE//feɪz//
 
; NAmE NAmE//feɪz//
 
Verb Forms present simple I / you / we / they phase
BrE BrE//feɪz//
 
; NAmE NAmE//feɪz//
 
he / she / it phases
BrE BrE//ˈfeɪzɪz//
 
; NAmE NAmE//ˈfeɪzɪz//
 
past simple phased
BrE BrE//feɪzd//
 
; NAmE NAmE//feɪzd//
 
past participle phased
BrE BrE//feɪzd//
 
; NAmE NAmE//feɪzd//
 
-ing form phasing
BrE BrE//ˈfeɪzɪŋ//
 
; NAmE NAmE//ˈfeɪzɪŋ//
 
 
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[usually passive] phase something to arrange to do something gradually in stages over a period of time the phased withdrawal of troops from the area Closure of the hospitals was phased over a three-year period. Word Origin early 19th cent. (in sense (2)): from French phase, based on Greek phasis ‘appearance’, from the base of phainein ‘to show’. Phrasal Verbsphase somethinginphase somethingout
See the Oxford Advanced American Dictionary entry: phase