To Dance to Jazz; Dent Carved Into a Flat Surface
Puzzle 18 of Uses for a Shoebox Pack
Question is: To Dance to Jazz; Dent Carved Into a Flat Surface
and the answer is: GROOVE
Word Meaning:
GROOVE — A long, narrow channel or depression; e.g., such a slot cut into a hard material to provide a location for an engineering component, a tire groove, or a geological channel or depression.
Definitions from Wiktionary.