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switch hook[′swich ‚hu̇k]
A switch on a telephone set that operates when the receiver is placed on the hook or removed from it.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
switch hookAlso called a "hook switch," it is the control mechanism that answers and hangs up a call on a telephone. When you place the handset in the telephone cradle, it depresses the switch hook's button and hangs up (puts the phone "on hook"). See off-hook and flash button.
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