Word after latch or glom

ONTO

Think of a two-letter preposition that follows verbs meaning "to grab" or "to fasten," often used to show attachment or direction.

This clue plays on common two-word phrases where "onto" follows the given words. "Latch onto" means to grab or attach firmly, while "glom onto" is slang for eagerly seizing or adopting something. The answer is simply the word that completes both expressions, making it a straightforward fill-in-the-blank style hint.