The term 'THEY MAY CRY 'UNCLE!' ' can be solved by the word 'NIECES', which is a 6 letter word. Nieces are female relatives, typically the daughters of one's siblings or of one's spouse's siblings. They are often seen as a source of joy and entertainment for their uncles and aunts. The phrase 'they may cry 'uncle!' ' is used to indicate that someone has had enough and wants to stop whatever activity they are doing.