1 adverb, preposition
in‧side1 S2 W2


in or into a container or other closed space so as to be completely covered or surrounded [≠ outside]:
The jewels were locked away inside the safe.
I sent the money inside an envelope addressed to Ann.
Carl picked up the book and stuffed it inside his jacket.
Her car was locked and the keys were inside.


in or into a building or room [≠ outside]:
It's raining. We'll have to go inside.
She could hear voices inside, but no-one came to the door.
Mail was piled up just inside the doorway.
The sound was coming from inside the house.
inside of American English
There were 20 people packed inside of her dorm room.


in a country or area - used when you want to emphasize that something is happening there and not in other places [≠ outside]:
Very little is known of events inside this mysterious country.
The guerrillas were said to be operating from bases inside the war zone.


BBCSSO if someone is inside a group or organization, they are part of it [≠ outside]:
women's influence inside the Party
The information comes from sources inside the company.
Discussions should involve local people both inside and outside the school.


if something happens inside you, or inside your head or mind, it is part of what you think and feel, especially when you do not express it:
You just don't understand how I feel inside!
Steve's a strange guy - you never know what's going on inside his head.
Anger bubbled up deep inside her.
inside of American English
Something inside of me told me not to trust him.


in your body:
She could feel the baby kicking inside her.
You'll feel better once you've got a good meal inside you (=after you have eaten something).


a) in less than a particular amount of time:
A full report is expected inside three months.
inside the hour/month etc (=before an hour, month etc has passed)
We'll be back inside the hour.
inside of especially American English
Our aim is to get the whole job finished inside of a week.
b) less than a particular amount of time [≠ outside]:
Jonson's time of 9.3 seconds was just inside the world record.


informalSCJ in prison:
My boyfriend's been inside for a year.

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