I. ˈyō(ˌ)yō noun
( plural yo-yos also yo-yoes )
Etymology: native name in the Philippines
: a thick deeply grooved double disk with a string attached to its center that is made to fall and rise to the hand by unwinding and rewinding on the string
II. noun
1. : a stupid or foolish person
2. : a condition or situation marked by regular fluctuations from one extreme to another
on the constant diet yo-yo —losing weight and gaining it back — William Stockton
III. ˈyōˌyō intransitive verb
( yo-yoed ; yo-yoed ; yo-yoing ; yo-yos )
Etymology: yo-yo , noun
: to move from one position to another repeatedly: as
a. : vacillate
b. : fluctuate