Word forms: safe seats
countable noun In politics, a safe seat is an area in which the candidate from one particular party nearly always wins by a large number of votes. [British] ⇒ ...the young and brilliant Anthony Blair first lost his deposit at Beaconsfield, and then secured the safe seat of Sedgefield. ⇒ The constituency I live in is a safe Labour seat.
COBUILD Advanced English Dictionary. Copyright © Harper Collins Publishers