noun pl. yo-yos
- a spool-like toy attached to one end of a string upon which it may be made to spin up and down
- Slang a person regarded as stupid, ineffectual, inept, eccentric, etc.
< ?: the toy came to the U.S. from the Philippines
Informal up-and-down; fluctuating; variable
intransitive verb yo-yoed, yo-yoing
Informal to move up and down; fluctuate; vary