___ the works (slow things down), 5 letters
Bungle, 5 letters
Clog, 5 letters
Ruin, 5 letters
Ruin, informally, 5 letters
Spoil, 5 letters
Spoil, in slang, 5 letters
Spoil, slangily, 5 letters
Be a bungler, 13 letters
Botch, 13 letters
Bungle things, 13 letters
Cause a major snafu, 13 letters
Make a mess of things, 13 letters
Ruin a good thing, 13 letters
Sabotage something, 13 letters