straight up

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adj. straight·er, straight·est
1. Extending continuously in the same direction without curving: a straight line.
2. Having no waves or bends: straight hair.
a. Not bent or bowed; rigid or erect: a straight, strong back.
b. Sports Of or relating to a midair position in diving or gymnastics in which the body is held rigid without bending at the hips or knees and the feet are kept together.
4. Perfectly horizontal or vertical; level or even: The mirror isn't straight.
a. Direct and candid: a straight answer.
b. Following a direct or correct method or approach; systematic: straight reasoning.
c. Coming from a reliable source; factual: a straight tip; straight information.
a. Showing or marked by honesty or fair-mindedness: straight business dealings.
b. Right; correct: made sure the facts were straight in the report.
7. Neatly arranged; orderly: The room is straight again.
a. Uninterrupted; consecutive: sick for five straight days; their fourth straight victory.
b. Having the parts or details in correct sequence.
c. Games Constituting a straight in poker.
9. Characterized by undeviating support, as of a principle or a political party: always votes a straight party line; a straight Democrat.
a. Not deviating from what is considered socially normal, usual, or acceptable; conventional.
b. Conventional to an extreme degree.
11. Heterosexual.
12. Slang Not being under the influence of alcohol or drugs.
a. Not deviating from the normal or strict form: straight Freudian analysis.
b. Not altered, embellished, or modified: does straight comedy.
a. Concerned with serious or important matters: a straight drama without comedy or music.
b. Of or relating to a straight man.
15. Not mixed with anything else; undiluted: straight bourbon.
16. Sold without discount regardless of the amount purchased.
1. In a straight line; directly.
2. In an erect posture; upright.
3. Sports In the straight position, as in diving.
4. Without detour or delay: went straight home.
5. Without circumlocution; candidly: I'll say it to you straight: you're wrong.
6. In a neat and orderly condition: put the living room straight.
7. In an honest, law-abiding, or virtuous manner: lives straight.
8. Without stopping; continuously: walked six hours straight.
9. Without embellishment or modification: tell the joke straight.
10. Without ice, water, or a mixer: drink whiskey straight.
a. The straight part, as of a road: "The car darted forward on to the straight" (Kingsley Amis).
b. The straight part of a racecourse between the winning post and the last turn.
2. A straight line.
3. A straight form or position.
4. Games A poker hand containing five cards of various suits in numerical sequence, ranked above three of a kind and below a flush.
5. A conventional person, especially one considered a member of established society.
6. A heterosexual person.
straight up
Served without ice, especially if chilled: whiskey straight up.

[Middle English, from past participle of strecchen, to stretch; see stretch.]

straight′ly adv.
straight′ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

straight up

sentence substitute
slang Brit honestly; truly; exactly
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in classic literature ?
We never said a word, but went straight up onto the hurricane-deck and plumb back aft, and set down on the end of the sky-light.
He lay on his back, staring straight up at one single star that rocked mistily through a thinning of cloud-stuff overhead.
Straight Up sends off 2016 with a New Year Countdown Party on December 31.