thirty

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oh dark thirty

A non-specific time in the early morning before the sun has risen. Based on the way in which military time is said aloud. ("Oh" is a common way of saying the number 0.) Why on earth are we meeting at oh dark thirty? The only thing we should be doing at this hour is sleeping! We'll have to leave at oh dark thirty if we want to reach Las Cruces before sundown.
See also: dark, oh, thirty

thirty pieces of silver

The amount Judas Iscariot was paid to betray Jesus Christ, used figuratively as a symbol of treachery or treason. She carried the guilt with her for the rest of her life after turning her husband over to the mob, and the money she made from it—her thirty pieces of silver—became utterly loathsome to her.
See also: of, piece, silver, thirty

thirty-something

1. adjective Of an unspecified age in one's thirties. He looks like he's in his 50s, but he's really just thirty-something.
2. noun A person who is in their thirties. Usually used in the plural. With so many college students in this town, it's nice to find a place that's geared more for thirty-somethings.

zero dark thirty

A non-specific time in the early morning before the sun has risen. Based on the way in which military time is said aloud. Why on earth are we meeting at zero dark thirty? The only thing we should be doing at this hour is sleeping! We'll have to leave at zero dark thirty if we want to reach Las Cruces before sundown.
See also: dark, thirty, zero
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

thirty-something (or forty-something, etc.)

an unspecified age between thirty and forty (forty and fifty, etc.). informal
Farlex Partner Idioms Dictionary © Farlex 2017

thirty pieces of silver

The symbol of treason. This term comes from the Bible, where Judas’s price for betraying Jesus was thirty pieces of silver (Matthew 26:15). It has symbolized betrayal ever since.
See also: of, piece, silver, thirty
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in periodicals archive ?
Diana Trilling's memoir chronicles their intellectual journey from thirties' radicalism to a more searching, skeptical liberalism.
There are scores of other interesting insights--how, for instance, the kind of intellectuals who became engage in the thirties spent the twenties "deliberately distanc[ing] themselves from public affairs; their refusal to talk or think about politics was how they guaranteed their intellectual purity.
Judson Memorial Church on New York City's Washington Square Park stood as a hothouse for avant-garde dance that, when it referred to political events, looked nothing like its thirties predecessor.
Mark Morris, in dances which veered from the whimsical to the passionate, allowed that petit men could dance on pointe in The Hard Nut (1991) and that solid women, whose strength echoed that of those thirties dancers, could lift men.
* Unlike the last two eras of concern for poverty - the thirties and the sixties - the middle and upper middle classes don't know poor people.
Figures shows a 110-percent increase among those under the age of thirty, and a 75-percent increase among those in their thirties and forties, according to the United States Amateur Ballroom Dancers Association, a nationwide organization that governs and promotes ballroom dance locally, nationally, and internationally.