'Byplay' definitions:

Definition of 'byplay'

From: WordNet
noun
Incidental activity performed by an actor for dramatic effect; "his business with the cane was hilarious" [syn: business, stage business, byplay]

Definition of 'Byplay'

From: GCIDE
  • Byplay \By"play\, n. Action carried on aside, and commonly in dumb show, while the main action proceeds. [1913 Webster]