latch on

verbs

take hold of or attach to
"The biochip latches onto the genes"
latch on
is a type of (narrower)
hold firmly
grasp, hold on
adopt
"take up new ideas"
fasten on, hook on, latch on, seize on, take up
understand, usually after some initial difficulty
"She didn't know what her classmates were plotting but finally caught on"
catch on, cotton on, get it, get onto, get wise, latch on, tumble, twig