180° turn, informally

The answer to the crossword question “180° turn, informally” is UIE. The clue suggests that the answer is a colloquial or informal term. A 180° turn means turning around completely, so the answer is likely to be a slang term for making a U-turn. UIE is a commonly used term for making a U-turn while driving. It is derived from the letters U and I on a road sign indicating the direction of a U-turn. The word “informally” in the clue indicates that the answer should not be a formal or technical term, but rather a more casual word or phrase commonly used in everyday language.