escalator clause
noun[C]
ukus(alsoescalation clause)COMMERCE,LAW
astatementin acontractthatallowsafigure, such asprices,wages,rent,interestrates, etc., to go up or down underparticularconditions:
Thebuyerput anescalationclausein hercontractthatensuredshe wouldmatchanyhigheroffer.