Origin of switchblade
Examples from the Web for switchblade
After a moment he withdrew it, and fumbled in his leg pocket withdrawing a switchblade knife.First on the Moon|Jeff Sutton
The other two curs outa the same litter: Switchblade an' Turkey-Buzzard, over there.
The next day, Switchblade Joe Bonney came in to make payment on a note we were holding on him.
The switchblade snicked back and disappeared into a side pocket of the jacket, while Ord watched it with fascinated eyes.Remember the Alamo|R. R. Fehrenbach
also switch-blade, type of folding pocket knife, 1932, from switch (n.) + blade. So called for the "switch" which is pressed to spring the knife open. Earlier a similar tool was known as an Arkansas toothpick (1837) and a clasp-knife (1755).