canary in a coal mine

a canary (bird from Canary Islands)

coal mine

accomplish, perform, fulfill

role

team

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

a sports team which not run by the company, but by the organization of like-minded people in the local community