Walking on __, Idiom for Exercising Caution
This page is the CodyCross answer for the clue below from Underground Worlds, Group 2170, Puzzle 4 (Phosphate Layers).
Question is: Walking on __, Idiom for Exercising Caution
and the answer is: EGGSHELLS
Word Meaning:
EGGSHELLS — plural of eggshell
Definitions from Wiktionary.