jam up - definition and synonyms

phrasal verb [intransitive/transitive]
present tense
I/you/we/theyjam up
he/she/itjams up
present participlejamming up
past tensejammed up
past participlejammed up
  1. same as jam2 (sense 3)

    A crumpled sheet had jammed up the whole photocopier.

See also main entry: jam