Underplot

1. n. A clandestine scheme; a trick.
2. n. A series of events in a play, proceeding collaterally with the main story, and subservient to it.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.