company

be (or err) in good company be in the same situation as someone important or respected.

part company: seepart.

present company excepted: seepresent.

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').