UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ɪnˈtruːdər/US:USA pronuncation: IPAUSA pronuncation: IPA/ɪnˈtrudɚ/

WordReference Random House Learner's Dictionary of American English © 2020
in•trud•er /ɪnˈtrudɚ/USA pronunciation  n. [countable]
  • a person who enters a place secretly or illegally:The alarms go off if an intruder enters the house.
  • See -trude-.
    Collins Concise English Dictionary © HarperCollins Publishers::
    inˈtruder /ɪnˈtruːdə/ n
    1. a person who enters a building, grounds, etc, without permission
    WordReference Random House Learner's Dictionary of American English © 2020
    in•trude /ɪnˈtrud/USA pronunciation   v.,  -trud•ed, -trud•ing. 
    1. to push, thrust, or force upon someone or something without invitation, permission, or welcome: [+ on + object]I don't want to intrude on you if you're busy.[no object]I hope I'm not intruding.[+ object]The judge intruded her prejudices into the case.
    See -trude-.
    WordReference Random House Unabridged Dictionary of American English © 2020
    in•trude  (in tro̅o̅d),USA pronunciation v.,  -trud•ed, -trud•ing. 
    1. to thrust or bring in without invitation, permission, or welcome.
    2. Geologyto thrust or force into.
    3. to install (a cleric) in a church contrary to the wishes of its members.

    1. to thrust oneself without permission or welcome:to intrude upon their privacy.
    in•truder, n. 
    in•truding•ly, adv. 
    • Latin intrūdere to push in, equivalent. to in- in-2 + trūdere to push
    • 1525–35
      • 4.See corresponding entry in Unabridged interfere, interlope. See  trespass. 

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