latch - definition and synonyms

noun [countable] 

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/lætʃ/
singularlatch
plurallatches
  1. 1
    an object for keeping a door, gate etc fastened shut, consisting of a metal bar that fits into a hole or slot
  2. 2
    a lock for a door that needs a key to open it from the outside but can be opened from the inside without a key by turning a small handle