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The Collaborative International Dictionary
In and out

In \In\, adv.

  1. Not out; within; inside. In, the preposition, becomes an adverb by omission of its object, leaving it as the representative of an adverbial phrase, the context indicating what the omitted object is; as, he takes in the situation (i. e., he comprehends it in his mind); the Republicans were in (i. e., in office); in at one ear and out at the other (i. e., in or into the head); his side was in (i. e., in the turn at the bat); he came in (i. e., into the house).

    Their vacation . . . falls in so pat with ours.
    --Lamb.

    Note: The sails of a vessel are said, in nautical language, to be in when they are furled, or when stowed. In certain cases in has an adjectival sense; as, the in train (i. e., the incoming train); compare up grade, down grade, undertow, afterthought, etc.

  2. (Law) With privilege or possession; -- used to denote a holding, possession, or seisin; as, in by descent; in by purchase; in of the seisin of her husband.
    --Burrill.

    In and in breeding. See under Breeding.

    In and out (Naut.), through and through; -- said of a through bolt in a ship's side.
    --Knight.

    To be in, to be at home; as, Mrs. A. is in.

    To come in. See under Come.

Wiktionary
in and out

n. (context idiomatic English) sexual intercourse, especially a brief one.

Wikipedia
In and out

In and out may refer to:

In and Out (Willie Hutch song)

"In and Out" is a song written and produced by Willie Hutch. It was released in 1982 by Motown Records. B-side is a song called "Brother's Gonna Work It Out" which was featured in the 1973 blaxploitation film The Mack. The single itself peaked at number 29 on the Billboard Dance chart, number 55 on the Black Singles chart and number 51 on the British pop chart.

In and Out (1914 film)

In and Out is a 1914 short film featuring Wallace Beery and Leo White. The short was produced by the Essanay Film Manufacturing Company and distributed by the General Film Company.

Usage examples of "in and out".

Stormwings circled the palace, snarling as crows darted in and out of their reach, calling crow insults.

White, fiery veils that had to represent the Goddess drifted in the morning sky, while everywhere the sparks that showed Kyprioth and the lesser tricksters winked in and out, points of color that never stayed the same hue for more than a moment.

People crept in and out using the tunnel system, but they had to be careful.

She traced the outline of his swollen lips with her fingers and darted playfully in and out of them until desire tore through her like a burn.

He had the cruiser racing, diving in and out of the traffic that grew heavier as he hit the center of town and diminished again as he roared into the industrial section the siren wailing in an ululating banshee cry.

She danced aside as she played, drifting in and out of the opaque steam, and behind the hanging shades, turning as she went.

It fought furiously, making frantic plunges at the dogs who dashed in and out to torment and bewilder it while they created the most zestfully excited of uproars.