Longman Dictionary of Contemporary English homepage

inside

2 noun
     
in‧side2
1

the inside

the inner part of something, which is surrounded or hidden by the outer part [≠ the outside]
on the inside
The apple's rotten on the inside.
the inside of
condensation on the inside of the window
The door had been locked from the inside.
2

inside out

with the usual outside parts on the inside:
You've got that jumper inside out.
Her umbrella blew inside out.
I always turn my jeans inside out to wash them.
3

turn a room/building etc inside out

to search a place very thoroughly by moving everything that is in it:
The drug squad turned the apartment inside out.
4

know something inside out

British English, know something inside and out American English to know something in great detail:
She knows her subject inside out.
5

on the inside

someone who is on the inside is a member of a group or an organization:
Someone on the inside must have helped with the robbery.
6

on the inside

British English if a car passes another car on the inside, it passes on the side that is away from the driver
7

somebody's inside/insides

informalHBHDF someone's stomach:
My insides are beginning to complain about the lack of food.

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