Answer: RIDEORDIE

The term "ride or die" refers to someone who is extremely loyal and devoted to another person, typically to the point of being willing to endure any hardship or even engage in risky or illegal activities on their behalf. It is often used to describe a close friend or romantic partner who supports and stands by the other person, regardless of the situation or consequences.

Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: One who's loyal to a fault. Explanations are generated by AI and may be inaccurate.