latch on

: to lay hold with or as if with the hands or arms

: to associate oneself intimately and often artfully

: any of various devices in which mating mechanical parts engage to fasten but usually not to lock something:

: a fastener (as for a door) consisting essentially of a pivoted bar that falls into a notch

: a fastener (as for a door) in which a spring slides a bolt into a hole

: to make fast with or as if with a latch