To play the piano. An allusion to its white keys, which were formerly made of ivory. My father used to love tickling the ivories after dinner.My friends asked if I would tickle the ivory at their wedding reception.
Play the piano, as in He went on tickling the ivories until three in the morning. This expression alludes to a piano's keys, traditionally made of ivory. [Colloquial; first half of 1900s]
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