Crossword clues for the word: GUMUP The word GUMUP has appeared as an answer to at least 7 crossword clues on different crossword puzzles. Crossword clues for GUMUP Showing 1 to 7 of 7 results Clue(s) ___ the works (slow things down) "Impede, as with ""the works""" "Ruin, informally" "Spoil, in slang" "Spoil, slangily" Bungle Make a mess of