One of the mysteries of the English language finally explained.
1‘we may have been poor but ratting on our friends was something we didn't do’
inform against, inform on, betray, be disloyal to, be unfaithful to, break one's promise to, break faith with, sell out, stab someone in the back
informal tell on, sell down the river, blow the whistle on, squeal on, stitch up, peach on, do the dirty on
British informal grass on, shop
North American informal rat out, finger, drop a dime on, drop the dime on
Australian informal pimp on, pool, put someone's pot on
2‘he accused the government of ratting on an earlier pledge’
break, renege on, go back on, back out of, default on, welsh on
break one's word
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