noun
    
    plural latches
    
    [count] a device that holds a door, gate, or window closed and that consists of a bar that falls into a holder when it is closed and that is lifted when it is open
    
    
    
    chiefly Brit :a type of door lock that can be opened from the inside by turning a lever or knob but can only be opened from the outside with a key
    
    
    
    on the latch
    
    Brit of a door :closed but not locked
    
    
    
    verb
    
    latches; latched; latching
    
    [+ obj] :to close or fasten (something, such as a door) with a latch
    
    
    
    verb
    
    latches; latched; latching
    
    compare 2latch
    
    latch on
    
    [phrasal verb] informal
    
    Brit :to begin to understand something
    
    
    
    latch on to (something) or latch onto (something)
    
    to grab and hold (something)
    
    
    
    
    
    to begin using or doing (something) in an enthusiastic way
    
    
    
    
    
    latch on to (someone or something) or latch onto (someone or something) :to stay close to (someone or something)