v.1. To narrow, diminish, or lessen gradually: The rod tapers off to a point at one end. The rain finally tapered off, and we went back outside.
2. To cause something to narrow, diminish, or lessen gradually: I tapered off the end of a stick and drove it into the ground. The doctor tapered the medication off as the patient recovered.
3. To gradually reduce someone's medication: After my symptoms disappeared, the doctor tapered me off the medication.