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bird in (one's) bosom
obsolete An oath of faith, servitude, piety, or conscience that is kept guarded in one's heart, mind, and spirit. Truly, my lord, I am at your service and loyal to your name, and I shall guard the bird in my bosom till my last breath.
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.
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.