Wiktionary
switchhook
alt. The spring-loaded button on a telephone that is depressed by the action of returning the handset to the cradle, thus terminate the call n. The spring-loaded button on a telephone that is depressed by the action of returning the handset to the cradle, thus terminate the call
Usage examples of "switchhook".
She rattled the switchhook a couple of times, then hung up the phone and slowly and dramatically beat her head against the wall.