Look of Determination in Sports; Put It On!
Puzzle 18 of Millennial Words Hard Pack
Question is: Look of Determination in Sports; Put It On!
and the answer is: GAMEFACE
Word Meaning:
GAME FACE — (idiomatic) The expression of one who is prepared for or is facing a lot of difficult and/or undesirable work, especially when it is imminent.
Definitions from Wiktionary.