be ringing off the hook
Of a telephone, to be ringing constantly or very frequently. Gosh, I'm exhausted—the phone was ringing off the hook all day at work! Ever since we announced the 2-for-1 deal, our phones have been ringing off the hook.
be ringing off the hook
mainly AMERICANIf your telephone is ringing off the hook, so many people are trying to call you that it is ringing all the time. His phone started ringing off the hook as banks and financial institutions begged for his help.