Etymology
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switch (n.)

1590s, "slender riding whip," probably from a Flemish or Low German word akin to Middle Dutch swijch "bough, twig," or swutsche, variant of Low German zwukse "long thin stick, switch," from Germanic *swih- (source also of Old High German zwec "wooden peg," German Zweck "aim, design," originally "peg as a target," Zwick "wooden peg"), perhaps connected with PIE root *swei- (2) "to swing, bend, to turn."

The meaning "device for changing the direction of something or making or breaking a connection" is first recorded 1797. "The peg sense suits the mech(anical) applications" [Weekley]; also compare switchblade. These senses in English might be a direct borrowing from those senses in Continental Germanic languages rather than a continuation of the "pliant wand" sense. The meaning "a change from one to another, a reversal, an exchange, a substitution" is first recorded 1920; extended form switcheroo is by 1933.

switch (v.)

1610s, "to strike with a switch," from switch (n.). Related: Switched; switching. The meaning "turn (off or on) with a switch device" is first recorded 1853 of trains on tracks, 1881 of electricity, 1932 of radio or (later) television. Sense of "shift, divert" is from 1860. Meaning "to change one thing for another" is recorded from 1919. Switch-hitter is 1945 in baseball slang; 1956 in the sense of "bisexual person."

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Definitions of switch
1
switch (v.)
change over, change around, as to a new order or sequence;
Synonyms: switch over / exchange
switch (v.)
exchange or give (something) in exchange for;
Synonyms: trade / swap / swop
switch (v.)
lay aside, abandon, or leave for another;
switch to a different brand of beer
She switched psychiatrists
Synonyms: shift / change
switch (v.)
make a shift in or exchange of; "First Joe led; then we switched";
Synonyms: change over / shift
switch (v.)
cause to go on or to be engaged or set in operation;
switch on the light
Synonyms: throw / flip
switch (v.)
flog with or as if with a flexible rod;
switch (v.)
reverse (a direction, attitude, or course of action);
2
switch (n.)
control consisting of a mechanical or electrical or electronic device for making or breaking or changing the connections in a circuit;
Synonyms: electric switch / electrical switch
switch (n.)
an event in which one thing is substituted for another;
switch (n.)
hairpiece consisting of a tress of false hair; used by women to give shape to a coiffure;
switch (n.)
railroad track having two movable rails and necessary connections; used to turn a train from one track to another or to store rolling stock;
switch (n.)
a flexible implement used as an instrument of punishment;
switch (n.)
a basketball maneuver; two defensive players shift assignments so that each guards the player usually guarded by the other;
switch (n.)
the act of changing one thing or position for another;
his switch on abortion cost him the election
Synonyms: switching / shift
From wordnet.princeton.edu