1. An interactive dialect of PL/I, related to CPS, dated about 1966.
The name is the abbreviation of “Remote Use of Shared Hardware”.
[“Introduction to RUSH”, Allen-Babcock Computing 1969.Sammet 1969, p.309.]
2. A high-level language that closely resembles Tcl but aimed to provide substantially faster execution. See An Introduction to the Rush Language (ftp://ginsberg.cs.berkeley.edu/pub/papers/asah/rush-tcl94.ps.gz). by Adam Sah, Jon Blow, and Brian Dennis (1994).