(informal)
we don't rat on our friends : INFORM ON, betray, be unfaithful to, stab in the back; informal tell on, sell down the river, blow the whistle on, squeal on, stitch up, peach on, do the dirty on; Brit. informal grass on, shop; N. Amer. informal rat out, finger.
he ratted on his pledge : BREAK, renege on, go back on, welsh on.
2192; headword