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Longman Dictionary of Contemporary English
hip flask
noun
EXAMPLES FROM CORPUS
▪ Bernice suddenly found she badly needed a drink, but her hip flask was empty.
▪ Biff had drawn up a stool nearby and was drinking from a hip flask enjoying the spectacle.
▪ But he filled his hip flask.
▪ Fergus had brought a leather case with him; it held three of the silver cups and a big hip flask.
▪ She took her hip flask from her coveralls and emptied it in one long gulp.
▪ The hip flask was in the glove compartment.
▪ The comedian waited were he was, swigging from his hip flask.
▪ Very handy with a hip flask, but didn't look as if he could tell a Renoir from a Renault.
Wiktionary
hip flask

alt. A container designed to hold small amounts of alcohol, especially spirits, for personal consumption on the go. n. A container designed to hold small amounts of alcohol, especially spirits, for personal consumption on the go.

Wikipedia
Hip Flask (comics)

Hieronymous "Hip" Flask is a fictional anthropomorphic hippopotamus who appears in comic books published by Active Images and Image Comics. He was created by Richard Starkings.

Hip flask

A hip flask is a thin flask for holding a distilled beverage.

Usage examples of "hip flask".

Hagrid had his usual enormous tankard in front of him, but Moody was drinking from his hip flask.

Barney would have slugged it out with all of them were it not for the fact that he still held the cap to the hip flask in one hand and had to screw it back on so that the tequila in the flask would not be spilled.

As Bram looked on, the woman dredged the needle through the contents of her hip flask, causing a coat of bluish powder to cling to needle and thread.

He must act out his role, feigning a grim resolution he fortified with furtive sips from his hip flask.