company manners
Exceptional manners; those that are preferred or required in and among polite society. One must at all times exhibit company manners if one is to make a good impression among the more influential members of society.
company manners
One's best behavior, as in George never interrupts when we have guests; he has fine company manners. This term employs company in the sense of "guests." An older variant, Tell me thy company and I'll tell thee thy manners, uses company in the sense of "companions." The current term implies that one is more mindful of politeness with invited guests.