byplay

noun

Etymology: Etymology tree English by- English play English byplay From by- + play.

1. Any action, carried out onstage during a performance, apart from the main action.

   “[...] there had been some amusing byplay with the enginemen as to what might be expected to happen if the engines failed to behave themselves properly.”

   “The father-son byplay is occasionally overdone and tedious, but there is a genuine warmth in both the Oland-Luke and the Toler-Sen Yung teamings.”

2. Any action, by supporting actor.