latch latch /ˈlætʃ/

noun

1. Catch for fastening a door or gate; a bar that can be lowered or slid into a groove  ( latch )
   catch for fastening a door or gate; a bar that can be lowered or slid into a groove
    I ensured the latch was securely fastened before leaving the barn.
   I ensured the latch was securely fastened before leaving the barn.
   
   
2. Spring-loaded doorlock that can only be opened from the outside with a key  ( door latch , latch )
   spring-loaded doorlock that can only be opened from the outside with a key
   

verb

1. () Fasten with a latch  ( latch )
   fasten with a latch
    Latch the door
   latch the door