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inside · preposition /ɪnˈsɑɪd/Full view
inside
A1 in or into a room, building, container, etc.
Dictionary example:

There were some keys inside the box.

Learner example:

I kept it inside the jewel box. (Key English Test; A2; Tamil)

inside · adverb /ɪnˈsɑɪd/
inside (CONTAINER)
A2 in or into a room, building, container, etc.
Dictionary example:

I'm freezing, let's go back inside.

Learner example:

We can stay inside and play with the computer. (Key English Test; A2; Norwegian)

inside (FEELING)
B2 If you have a feeling inside, you have a feeling although you might not show it to other people.
Dictionary example:

She couldn't cope with the grief she felt inside.

Learner example:

They had to go to the vet more often but it wasn't hard for them because of the love that they felt inside. (First Certificate in English; B2; Turkish)

inside · adjective always before noun /ˈɪn.sɑɪd/
inside
B2 in or on the part of something under its surface
Dictionary example:

He put the documents carefully in his inside pocket.

Learner example:

At first Chris didn't seem to recognize him, but as soon as he did, his hand reached [into] his inside pocket. (First Certificate in English; B2; French)

inside information/knowledge, etc.
C2 information that is only known by people who are part of an organization, group, etc.
Dictionary example:

I needed someone with inside knowledge to back up my story.

Learner example:

I'm pretty sure that getting in touch with the customs and lifestyle of another country will open a completely new horizon to the students and they'll be enchanted by the 'inside knowledge' they will be able to gain. (Certificate of Proficiency in English; C2; German)

inside · noun C usually no plural /ɪnˈsɑɪd/
inside
B2 the inner part, space or side of something
Dictionary examples:

Did you clean the inside of the car?

The hotel looked shabby from the street, but it was fine on the inside.

Learner example:

Anyway, after the show I felt hungry so I went to the restaurant but it was closed because they were having the inside altered. (First Certificate in English; B2; )

inside out
B2 If a piece of clothing is inside out, the part that is usually outside is on the inside.
Dictionary example:

She had her sweater on inside out.

know sth inside out
C1 to know everything about something
Dictionary example:

He knows the system inside out.

Learner example:

The participants got to know Britain inside out and they are happy with the knowledge they gained. (Certificate in Advanced English; C1; Chinese)

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