Words related to switch
switchblade (n.) 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).
switchboard (n.) also switch-board, "device for making interchangeable connections between many circuits," 1867, from switch (n.) + board (n.1).