Did you know?

Click any word in a definition or example to find the entry for that word

jam up

 - definition

What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.

phrasal verb [intransitive/transitive]
Word Forms
present tense
I/you/we/theyjam up
he/she/itjams up
present participlejamming up
past tensejammed up
past participlejammed up

Related dictionary definitions

  1. same as jam2 (sense 3)

    A crumpled sheet had jammed up the whole photocopier.

See also main entry: jam

Word of the Day


the occasion on which Jesus Christ was brought back to life after his death, according to the Bible


A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog