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black triangle

1. An unidentified flying object (popularly known as a UFO) in the shape of a dark triangle, typically with points of light in each corner. I know you think I'm crazy, but every spring, I see those black triangles appearing over my corn fields at night!
2. In Nazi Germany, a badge assigned to concentration camp inmates considered "asocial" or mentally unfit for work. Her clinical depression, which was vilified by the Nazis, meant she had to wear a black triangle in the concentration camp.
See also: black, triangle

eternal triangle

A sexual encounter or relationship between three people. Although exciting at first, the eternal triangle caused their relationship to suffer and ultimately end.
See also: eternal, triangle
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

(the) eternal triangle

a sexual or emotional relationship involving two women and one man or two men and one woman. (*Typically, a couple [man and woman] and another man or woman.) Henry can't choose between his wife and his mistress. It's the eternal triangle. I'm surprised Jane doesn't get tired of the eternal triangle. She goes out with Peter at the weekend and Jim during the week.
See also: eternal, triangle
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

eternal triangle

A relationship involving three lovers, such as two women involved with one man or two men with one woman. For example, The plot of the murder mystery revolved around the eternal triangle of a husband, wife, and another woman . [c. 1900]
See also: eternal, triangle
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

eternal triangle

a relationship between three people, typically a couple and the lover of one of them, involving sexual rivalry.
See also: eternal, triangle
Farlex Partner Idioms Dictionary © Farlex 2017

eternal triangle, the

A threesome of lovers, either two men involved with or vying for one woman or two women and one man. “Eternal” here simply means that this situation has occurred over and over through the ages. The term has been traced to a book review appearing in the London Daily Chronicle in 1907, describing a novel that “deals with the eternal triangle, which, in this case, consists of two men and one woman.”
See also: eternal
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in periodicals archive ?
8 squares 4 3/8 x 4 3/8" cut to make 16 triangles [??] (A)
6 Cut to make another triangle. Continue aligning the 60[degrees] mark as described to cut remaining strip into triangles.
Now you'll make the triangles "stand up" and form a circle by pulling the two ends of the triangle row together.
The information for the development triangles is provided for 11 reserving classes of business that fall under the Company's two reportable segments, Insurance and Reinsurance.
Pat gave her students no hints at all as to how the triangles should be recorded, and told them to choose any method that suited them.
Pin each triangle to the tape/ribbon at equal distances.
Triangles in a same plane are said to be intersectant, if the overlapping area of two triangles is larger than zero.
2D packing problem mainly includes circles packing problem, rectangles packing problem, and triangles packing problem.
In this paper we introduce a new class of trapezoids by cutting diagonals of Gog and GOGAm triangles on the left instead of the right.
We have managed to find seven triangles with six lines but then get a bit stuck ...
You will have made lots of small triangles. But you have actually made four sizes of triangles.
Two triangles and ABC and [A.sub.1][B.sub.1][C.sub.1], where [A.sub.1] [member of] BC, [B.sub.1] [member of] AC, [C.sub.1] [member of] AB, are called inscribed ortho homological triangles if the perpendiculars in [A.sub.1], [B.sub.1], [C.sub.1] on BC, AC, AB respectively are concurrent.
Triangles are among the most reliable of the continuation patterns.