1 B1 idiomatic neutral
To accidentally enter a room and discover someone in a private or embarrassing situation.
"I walked in on my roommate and his girlfriend — I didn't know he had company."
inseparable
walk in on
B1 neutral inseparable transitive
To accidentally enter a room and discover someone in a private, embarrassing, or unexpected situation.
In plain English
To accidentally go into a room and find someone doing something private or embarrassing.
What does "walk in on" mean?
2 meanings, ordered from most common to least. Color-coded by CEFR level.
2 B1 idiomatic neutral
To accidentally interrupt a private conversation or meeting by entering the room.
"I'm sorry — I didn't mean to walk in on you. I'll come back later."
inseparable
Literal vs figurative
Words literally mean
To walk in (to a place) on (someone doing something) — somewhat transparent.
Actually means
To accidentally go into a room and find someone doing something private or embarrassing.
Usage tip
Always followed by the person discovered (e.g., 'walk in on someone'). The situation discovered is often private or embarrassing. Common in both British and American English. Frequently appears in comedy or drama contexts.
Words that pair with "walk in on"
Natural word combinations native speakers use most often.
argument private moment conversation someone couple meeting
How to conjugate "walk in on"
The five tense forms you'll use most often.
Base
walk in on
I/you/we/they
3rd person
walks in on
he/she/it
Past simple
walked in on
yesterday
Past participle
walked in on
have + pp
-ing form
walking in on
continuous
Hear "walk in on" in the wild
Listen to native speakers using "walk in on" in real YouTube videos — click a clip to watch it on Looplines.
Other ways to say "walk in on"
Swap in when you want variety — tap a linked one to explore it.
Keep exploring
Jump to every phrasal verb built on the same verb, particle, or level.