latch onto somebody/something ( also latch on to somebody/something ) phrasal verb informal ( see also ↑ latch )
1 . to become very interested in something:
Don’t just latch on to the latest management fads.
2 . to follow someone and keep trying to talk to them, get their attention etc, especially when they would prefer to be left alone:
He latched onto Sandy at the party and wouldn’t go away.
3 . to hold tightly to something with your hand, mouth etc:
a baby latching on to its mother’s breast