uncle
Bob's your uncle: seebob.
cry (or say or yell) uncle surrender or admit defeat. North American informal
☞ Uncle in this context is probably a folk-etymological alteration of Irish Gaelic anacol 'mercy, quarter, safety'.
1989Guy VanderhaegheHomesick Beat him six ways to Sunday and he still would never cry uncle or allow that there was an outside chance of his ever being wrong.
a Dutch uncle: seeDutch.
I'll be a monkey's uncle: seemonkey.
Uncle Tom Cobley (or Cobleigh) and all used to denote a long list of people. British informal
☞ Uncle Tom Cobley is the last of a long list of men enumerated in the ballad 'Widdicombe Fair', which dates from around 1800.
1966Guardian It seems clear that a compromise, half-way solution had equally been ruled out by Government, Opposition, economists, press, TV, Uncle Tom Cobleigh and all.