Definition of latch on phrasal verb from the Oxford Advanced American Dictionary

 

latch on

 phrasal verb
phrasal verb
 
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Phrasal Verbs

latch on (to something)

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latch onto something

(informal)
 
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to understand an idea or what someone is saying It was a difficult concept to grasp, but I soon latched on. He latched on to the truth.

    latch on (to somebody/something)

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    latch onto somebody/something

    (informal)
     
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  1. 1to become attached to someone or something antibodies that latch onto germs
  2. 2 to join someone and stay in their company, especially when they would prefer that you not be with them
  3. 3to develop a strong interest in something She always latches on to the latest craze.
See the Oxford Advanced Learner's Dictionary entry: latch on