Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
phase [feɪz] n фа́за
vt
to phase sth inпоэта́пно вводи́ть*(ввести́*perf) что-н
to phase sth out ликвиди́ровать (impf/perf) что-н
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.