Pronunciation: ' y ō -( ˌ )y ō
Function: noun
Inflected Form: plural yo-yos
Etymology: probably from Ilocano yóyo, or a cognate word in a language of the Philippines
Date: 1915
1 : a thick grooved double disk with a string attached to its center axle that is made to fall and rise to the hand by unwinding and rewinding on the string
2 : a condition or situation marked by regular fluctuations from one extreme to another
3 : a stupid or foolish person