Synonyms 7.Inside,interior both refer to the inner part or space within something. Inside is a common word, and is used with reference to things of any size, small or large: the inside of a pocket. Interior, somewhat more formal, denotes the inner part or the space or regions within; it usually suggests considerable size or extent, and sometimes a richness of decoration: the interior of a country, of the earth, of a cathedral.
mod. drunk. : Wayne spends every weekend inside out.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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American Heritage
Idioms & Phrases
inside out
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]