Found 2 items, similar to phase in.
English → English (WordNet) Definition: phase in phase in v : introduce gradually [ant: phase out]
English → English (gcide) Definition: Phase in Phase in \Phase" in`\ (f[=a]z" [i^]n`), v. t. To begin an activity or to incorporate new elements or replace older elements of an activity in steps, or by degrees. [PJC]