- with the inner side reversed to face the outside.
- thoroughly; completely: She knew the work inside out.
Origin of inside
Synonyms for inside
Antonyms for inside
late 14c., ynneside "interior of the body," compound of in (adv.) + side (n.). The adjective is 1610s, from the noun. Inside job "robbery, espionage, etc., committed by or with the help of a resident or servant of a place" is attested by 1887, American English (also, late 19c., early 20c., "indoors work"). Inside track "advantage" is metaphoric because those lanes are shorter on a curved track. Inside of, in reference to time, is from 1839.
With the inner surface turned out or revealed, as in He wore his shirt inside out. This expression dates from about 1600 and was soon used figuratively, as in He turned the verses inside out and revealed their hidden sense.
Extremely well, thoroughly, especially alluding to knowing something. For example, He knows this system inside out. [First half of 1900s]
In addition to the idioms beginning with inside
- inside of
- inside out
- inside track, the
- on the inside
- step in (inside)