Latch (noun)

1. A mechanism for holding a door, gate, or lid closed and fastening it securely.
2. A device for locking a gate or door.

Origin:

The word 'latch' comes from the middle english word 'latch' meaning 'a device for fastening a door or gate.'.

Examples:

1. She unlatched the gate and walked through it.
2. He fumbled with the latch before finally opening the door.
3. The latch on the window was broken, allowing it to swing open in the wind.
4. She pushed down on the latch to secure the lid of the box.
5. The latch of the door made a clicking sound when it was shut.