noun
a fundraising event in which volunteers make phone calls to solicit donations or pledges
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The university alumni association organized a phonathon to raise funds for scholarships.
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I volunteered to make calls during the phonathon to ask for donations.
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I heard the phonathon was a real snoozefest, nobody wanted to pick up the phone.
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The phonathon was like a marathon of phone calls, lasting for hours on end.