jam up

verb

To cause (something) to become blocked or clogged; to clog up.

“The traffic jammed up on the boulevard.”

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Meanings

verbjam up (third-person singular simple present jams up, present participle jamming up, simple past and past participle jammed up)

present singular third person jams up · participle present jamming up · participle past jammed up · past jammed up

  1. transitiveTo cause (something) to become blocked or clogged; to clog up.
  2. intransitiveTo become blocked or clogged.

    The traffic jammed up on the boulevard.

  3. figurativelytransitiveTo cause trouble; to stop or inhibit (someone, something).
Cite this entry
APA

jam up. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/jam%20up

MLA

“jam up.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/jam%20up. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “jam up,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/jam%20up.

Source: jam up on Wiktionary, CC BY-SA 4.0.