'latch on' definitions:

Take hold of or attach to; "The biochip latches onto the genes"

Adopt; "take up new ideas" [syn: take up, latch on, fasten on, hook on, seize on]

Understand, usually after some initial difficulty; "She didn't know what her classmates were plotting but finally caught on" [syn: catch on, get wise, get onto, tumble, latch on, cotton on, twig, get it]