noun
intruder
ihn-TROO-duh
noun
1
A person who enters a place without permission.
"The alarm went off the moment the intruder opened the window."
"Police were called after neighbours spotted an intruder in the yard."
How to Use Intruder
Learner’s notesIn plain EnglishSomeone who breaks in or shows up uninvited, often with bad intent.
Common pairings
spot an intruder
catch an intruder
armed intruder
Word Forms
intruders plural
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The alarm went off the moment the _____ opened the window.
Etymology
From intrude + -er.