а> понимать; Would you mind repeating that, I didn't quite latch. б> присоединяться к кому-л. без приглашения; The party of climbers was all organized when this other man latched on and demanded to come with us.
LATCH ON
Англо-русский перевод LATCH ON
English-Russian Muller's dictionary 24 edition. Англо-Русский словарь Мюллера 24 редакция. 2012