yo-yo definition by Wordo

Noun

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

.

Verb

To

vacillate

;

to

move

up

and

down

.