The Collaborative International Dictionary
Underaction
Underaction \Un"der*ac`tion\, n. Subordinate action; a minor action incidental or subsidiary to the main story; an episode.
The least episodes or underactions . . . are parts
necessary or convenient to carry on the main design.
--Dryden.
Wiktionary
underaction
n. subordinate action; a minor action incidental or subsidiary to the main story; an episode.