A comic pairing in which humor is derived from the uneven relationship between two partners, usually of the same gender, age, ethnic origin and profession, but often with drastically different personalities or behavior
Rosencrantz and Guildenstern are a double act engaged to spy on Hamlet, with the result that he has at each ear a hearer..
Two comedians or entertainers who perform together are referred to as a double act. Their performance can also be called a double act. a famous comedy double act. two actors, especially comedians, who perform together
{s} having twice the ordinary effectiveness or strength; operating or acting in two directions or both motions and producing a doubled result (double-acting engine)