From Longman Dictionary of Contemporary Englishlatch onto somebody/something (also latch on to somebody/something) phrasal verb informal1 INTERESTEDto become very interested in something Don’t just latch on to the latest management fads.2 ATTENTIONto 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 → latch→ See Verb table
Examples from the Corpus
latch onto • And you have to latch on to something, some admirable qualities they have.• Even Starbucks has latched on to the trend, adding a drive-through window at a store last month.• He'd been in line for it this year until these two monkeys had latched on to him.• I latched on to her like my lifeline.• Many have thus latched on to Oakeshott's use of tradition to identify him as a Burkean conservative.• She had stupidly given him the name Marie and he had latched on to it.• The industry is betting that consumers will latch on to the idea.• These are probably latched on to by carp when digging for food. 