Crossword clues for the word: TIGHTENUP The word TIGHTENUP has appeared as an answer to at least 2 crossword clues on different crossword puzzles. Crossword clues for TIGHTENUP Showing 1 to 2 of 2 results Clue(s) 27-Across song that won a Grammy Award in 2011 (2 wds.) Make stricter