inside

1 inside /ɪnˈsaɪd/ /ˈɪnˌsaɪd/ noun
plural insides
1 inside
/ɪnˈsaɪd/ /ˈɪnˌsaɪd/
noun
plural insides
Britannica Dictionary definition of INSIDE
1 
[count] : an inner side, edge, or surface of something — usually singular — often + of
2 
a  the inside : an inner part of something (such as a building or machine)
— often plural
b  [count] informal : the inner parts (such as the heart and stomach) of a person's body — usually plural

on the inside

1 
: on the inner side, edge, or surface of something
2 
baseball : on the side of home plate nearest the batter
3 
— used to describe how someone is feeling
4 
: in a position within an organization or group
5 
: in prison
2 inside /ɪnˈsaɪd/ /ˈɪnˌsaɪd/ adjective
2 inside
/ɪnˈsaɪd/ /ˈɪnˌsaɪd/
adjective
Britannica Dictionary definition of INSIDE
always used before a noun
1 
: located on or near the inner side, edge, or surface of something
2 
a  : coming from someone within a group or organization : relating to or having information that is known only to a special group of people
b  : done by someone within a group or organization
3 inside /ɪnˈsaɪd/ /ˈɪnˌsaɪd/ preposition
3 inside
/ɪnˈsaɪd/ /ˈɪnˌsaɪd/
preposition
Britannica Dictionary definition of INSIDE
1 
: in or into the inner part of (something or someone)
2 
a  : within the borders or limits of (something)
b  : before the end of (a period of time)
3 
: belonging to (a group or organization)

inside of

chiefly US
: inside
4 inside /ɪnˈsaɪd/ /ˈɪnˌsaɪd/ adverb
4 inside
/ɪnˈsaɪd/ /ˈɪnˌsaɪd/
adverb
Britannica Dictionary definition of INSIDE
1 
: in the inner part of something
2 
: in or into the inner part of a building, room, etc.
3 
informal : in prison

inside out

1 
: so that the inner surface becomes the outer surface
2 
informal : very well and thoroughly

turn (something) inside out

informal
1 
: to cause (a place) to become disorganized while you are trying to find something
2 
: to change (something) completely