Many common British phrases describe what colleagues owe one another.
To do one’s bit: To do a fair share of the shared work.
To pull one’s weight: To work as hard as the others. A colleague who is not pulling his weight is criticized behind his back, not to his face.
To let the side down: To fail the group through one’s own behavior.
It’s your round: It is your turn to buy drinks for the group.
To send someone to Coventry: To stop speaking to someone as a punishment.