Green’s Dictionary of Slang

1. in pl. one’s parents.

1940

Pittsburgh Courier (PA) 27 Apr. 7/6: Lesson 1: How to Collar a Chic. If the fowl is fly and doesn’t gum beat so sporty, try to drift to the donnie’s castle and skin-shake with the raisers.

2. a lookout, e.g. for a street drug dealer.

1992

R. Price Clockers 10: You ain’t no raiser, Pea-nut. Where them bottles?