Definition of phase verb from the Oxford Advanced American Dictionary

  

phase

 verb
verb
NAmE//feɪz//
 
[usually passive]phase somethingVerb Forms present simple I / you / we / they phase
 
he / she / it phases
 
past simple phased
 
-ing form phasing
 
 
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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. Phrasal Verbsphase somethinginphase somethingout
See the Oxford Advanced Learner's Dictionary entry: phase