latch on v.,
informal 1. To get hold of; grasp or grab; catch.
He looked for something to latch onto and keep from falling. The football player latched onto a pass. 2. slang To get into your possession.
The banker latched onto a thousand shares of stock. 3. slang To understand.
The teacher explained the idea of jet engines until the students latched onto it. Synonym: CATCH ON.
4. informal To keep; to hold.
The poor woman latched onto the little money she had left. 5. slang To stay with; not leave.
Marie and Dick wanted to go to the movies by themselves, but Mane's little brother latched onto them. [TahlilGaran] English Idioms Dictionary ▲