One of the mysteries of the English language finally explained.
An electric switch that is operated by a push-button; (originally) one hanging from the end of a length of flexible wire; (in later use) especially one on a piece of radio communication equipment, typically permitting transmission when depressed and reception when released. Now chiefly "pressel switch".
Late 19th century. Origin uncertain; probably from press + a suffix of uncertain origin (perhaps -el or -el), perhaps after tassel.
In this article we explore how to impress employers with a spot-on CV.