Answer: phasein

AnswerCrossword Clue
PHASEINActualize gradually
PHASEINIntroduce by degrees
PHASEINEstablish gradually
PHASEINGradually introduce
PHASEINIntroduce
PHASEINIntroduce at intervals.
PHASEINNot start all at once
PHASEINStart gradually, as a program
PHASEINAdd by degrees
PHASEINIntroduce gradually