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flash button

A button on a telephone that takes the place of pressing and quickly letting go of the switch hook. It is used for various functions, including calling the attendant, call waiting, call transfer, conferencing and placing a line on hold. See switch hook.



switch hook

Also 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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