A toy consisting of a spheroidal or cylindrical spindle having a circular groove in which string is wound; it is used by holding the string in the fingers and reeling the spindle up and down by movements of the wrist.

(intransitive) To vacillate; to move up and down.

plural of yo-yo

Third-person singular simple present indicative form of yo-yo

present participle of yo-yo

simple past tense and past participle of yo-yo

(computing, slang) The condition of having repeated intermittent failures, such that the system alternates between being up and down.

(medicine) The reflux of urine from one moiety of the kidney down the ureter and up into the other moiety, instead of draining into the bladder.

(astronautics) One of the weights unreeled from a spacecraft during yo-yo despin to reduce the spacecraft's rotation rate.

(aviation, military) A dogfighting maneuver used to increase the closure rate of the attacker during a turn, involving the attacker temporarily giving up some altitude to simultaneously increase airspeed and allow them to turn more steeply, enabling the attacker to cut across the defender's turn and catch up with the defender.