Switch hook | Article about switch hook by The Free Dictionary
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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.
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.
References in periodicals archive
Thus the subscribers had to perform only one action: flashing the switch hook.
These measurements were made from the end of the Call Waiting tone to the moment the subscribers flashed the switch hook to talk to the new caller.