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A musical instrument borrowed or used as a backup for when a musician forgets or doesn't have his own. An apple cider instrument may typically be broken, in poor condition, and/or very old. A school with a music program may have apple cider instruments on hold for use by forgetful students.
Alex had no idea there was a band rehearsal today, so he borrowed an apple cider instrument from the reserves in the back.
by UncleFitzy June 18, 2010
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