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straight (adj.1)

late 14c., "direct, undeviating; not crooked, not bent or curved," of a person, "direct, honest;" properly "stretched," adjectival use of Old English streht (earlier streaht), past participle of streccan "to stretch" (see stretch (v.)). Related: Straightly; straightness.

Meaning "true, direct, honest" is from 1520s. Of communication, "clear, unambiguous," from 1862. Sense of "undiluted, uncompromising" (as in straight whiskey, 1874) is American English, first recorded 1856. As an adverb from c. 1300, "in a straight line, without swerving or deviating." Theatrical sense of "serious" (as opposed to popular or comic) is attested from 1895; vaudeville slang straight man first attested 1923.

Go straight in the underworld slang sense is from 1919; straighten up "become respectable" is from 1907. To play it straight is from 1906 in theater, 1907 in sports ("play fair"), with figurative extension; later perhaps also from jazz. Straight arrow "decent, conventional person" is 1969, from archetypal Native American brave name. Straight shooter is from 1928. Straight As "top grades" is from 1920.

straight (adj.2)

"conventional," especially "heterosexual," 1941, a secondary sense evolved from straight (adj.1), probably suggested by straight and narrow path "course of conventional morality and law-abiding behavior," which is based on a misreading of Matthew vii.14 (where the gate is actually strait), and the other influence seems to be from strait-laced.

straight (n.)

1640s, "a level position," from straight (adj.1). From 1864 as "straight part of a race track." Poker sense attested from 1841. Meaning "conventional person" is first recorded 1967, from straight (adj.2).

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Definitions of straight
1
straight (adj.)
without evasion or compromise;
Synonyms: square / straightforward
straight (adj.)
successive (without a break);
sick for five straight days
Synonyms: consecutive
straight (adj.)
having no deviations;
straight lines
straight teeth
straight roads across the desert
straight shoulders
straight (adj.)
(of hair) having no waves or curls;
her naturally straight hair hung long and silky
straight (adj.)
erect in posture;
sit straight
Synonyms: unbent / unbowed
straight (adj.)
in keeping with the facts;
made sure the facts were straight in the report
set the record straight
straight (adj.)
characterized by honesty and fairness;
straight dealing
Synonyms: square
straight (adj.)
no longer coiled;
Synonyms: uncoiled
straight (adj.)
free from curves or angles;
a straight line
straight (adj.)
neatly arranged; not disorderly;
the room is straight now
straight (adj.)
not homosexual;
straight (adj.)
accurately fitted; level;
Synonyms: true
straight (adj.)
(of an alcoholic drink) without water;
Synonyms: neat / full-strength
straight (adj.)
following a correct or logical method;
straight reasoning
straight (adj.)
rigidly conventional or old-fashioned;
Synonyms: square
2
straight (n.)
a person having a sexual orientation to persons of the opposite sex;
Synonyms: heterosexual / heterosexual person / straight person
straight (n.)
a poker hand with 5 consecutive cards (regardless of suit);
straight (n.)
a straight segment of a roadway or racecourse;
Synonyms: straightaway
3
straight (adv.)
without deviation;
Synonyms: directly / direct
straight (adv.)
in a forthright manner; candidly or frankly;
told me straight out
Synonyms: directly / flat
straight (adv.)
in a straight line; in a direct course;
the road runs straight
From wordnet.princeton.edu