stick together as if with gum;
"the inside of the pipe has gummed up"
- I forgot that my helmet's visor was still down, so when I spat, the gum stuck against it.I was temporarily blinded and I crashed into the bushes.
- The naughty girl jumbled her clothes up.
- Your father flared up because you had made a mess of his study.
- Their interference bollixed up the whole deal.
- Anything that can screw up will!