Playing With a Toy That Goes Up and Down on String

This page is the CodyCross answer for the clue below from California, Group 1153, Puzzle 4 (Aerospace Industry).

Question is: Playing With a Toy That Goes Up and Down on String

and the answer is: YOYOING

Word Meaning:

YOYOING — present participle and gerund of yoyo

Definitions from Wiktionary.