Eavesdrop
Puzzle 11 of Nail Salon Easy Pack
Question is: Eavesdrop
and the answer is: LISTEN
Word Meaning:
LISTEN — (intransitive except in archaic usage) To use one's sense of hearing and auditory cognition in an intentional way; to make deliberate use of one's ears; to pay attention to or wait for a specific sound.
Definitions from Wiktionary.