Be the coolest Crossword Clue

 The answer to the crossword clue "Be the coolest" with 4 letters is ACE.

The word "ace" can mean many things, but in the context of a crossword puzzle, it is most likely referring to the highest possible score in a game of cards. An ace is a card with a value of one, and it is the highest-ranking card in most card games.

In other contexts, the word "ace" can also mean to do something perfectly or flawlessly. For example, a baseball player might be called an "ace" if they consistently pitch shutouts.

So, the answer to the crossword clue "Be the coolest" is ACE, because being the coolest is often associated with being the best or the most successful.

Here are some other possible answers to the crossword clue "Be the coolest":

BADASS

DASHING

FLY

RAD

SWEET

The best answer will depend on the specific context of the crossword puzzle.