two's company

two's company(, three's a crowd)

A third person would make a group of people awkward or uncomfortable, especially when the other two are lovers or close friends. I was worried when the new boy moved into the neighborhood and started hanging out with John and his best friend—two's company, but three's a crowd.
Farlex Dictionary of Idioms.

two's company

used to indicate that two people, especially lovers, should be left alone together.
The expression is a curtailed version of the proverb ‘Two's company, three's a crowd’ (or, in an alternative formulation, ‘Two's company, three's none’).
See also: company
Farlex Partner Idioms Dictionary

two’s ˈcompany (, three’s a ˈcrowd)

(saying) two people, especially two lovers, are happier alone than within a group of three: ‘Do you want to come with us?’ ‘I don’t think so. Two’s company...’
See also: company
Farlex Partner Idioms Dictionary
See also:
  • an awkward customer
  • customer
  • heavy atmosphere
  • a heavy silence/atmosphere
  • slouch behind
  • slouch behind (someone or something)
  • little love lost between (two people)
  • heavy silence
  • nerd magnet
  • a tough spot
References in classic literature
"Let the parson and his sweetheart be," they called out; "two's company, miss, and three isn't." Mr.
I Say No
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TWO'S COMPANY IS CELEBRATING ITS 40TH ANNIVERSARY this year, and its offerings at the Atlanta International Gift Market shows that it plans to continue its trend-setting ways.
"With Tozai, we've attempted to be sensitive on price points," said Tom Gottlieb, Two's Company president.
Two's Company: bring on Atlanta
She has made dances about the relationships between people in works such as her Diamond Project piece, Two's Company, and in the earlier May Dances.
Her project work, Two's Company, which premiered on May 28, 1992, and is now in the repertory of Rhode Island Ballet, was set to the first two movements of Dvorak's String Quartet in F Major, Op.
Choreographing coast to coast
Two's Company was founded on the principles of innovation and creativity, Gottlieb said.
"We were the Lucite kings of the '70s," said Gottlieb, who still sees versions of Two's Company products--uncopyrighted items like Lucite earring holders and drawers-in stores today.
In good company: as the gift show season gets into full swing, Two's Company keeps making its presence felt
"This is our 'couture' division," said Bobbie Gottlieb, chief executive officer of Two's Company, of Tozai.
Tozai, which has been around for five years, is only one of three divisions of Two's Company. The others include the original Two's Company and the newest addition, Cupcakes & Cartwheels, which was added almost three years ago.
TWO'S COMPANY BETTING ON VEGAS FOR TOZAI
"Just as we found with the Two's Company collection, the customer's interest is best served with a full-time, focused and knowledgeable salesperson presenting this collection," said Tom Gottlieb, president of Two's Company, in a statement.
"Two's Company has been looking to invest in other opportunities for about one year now.
TWO'S COMPANY LAUNCHES STUDIO 2
Two's Company, the Mount Vernon, N.Y.-based manufacturer of gifts and decorative accessories, has opened a new permanent showroom in the Dallas Trade Mart.
The expansion into the Southwest brings the total number of Two's Company's sales force to 70 full-time associates.
Two's Company Hires Regional Manager