名詞 latch:

1. spring-loaded doorlock that can only be opened from the outside with a key
   同義詞：door latch
2. catch for fastening a door or gate; a bar that can be lowered or slid into a groove

動詞 latch:

1. fasten with a latch

1. Please leave the door latch shut.
   請把門閂上。
2. This door won't latch properly.
   這門閂不牢。

latch

n.（名詞）
A fastening, as for a door or gate, typically consisting of a bar that fits into a notch or slot and is lifted from either side by a lever or string.
門閂：閂，例如門閂，尤指帶有一橫銷，插在槽或狹縫中通過把手或鐵鏈從一頭提到另一頭
A spring lock, as for a door, that is opened from the outside by a key.
彈簧鎖：從外面用鑰匙打開的彈簧鎖，用于門上的
v.（動詞）
latched,latch.ing,latch.es
v.tr.（及物動詞）
To close or lock with or as if with a latch.
鎖住：用門閂或好象用門閂鎖住或關住
v.intr.（不及物動詞）
To have or be closed with a latch.
鎖：用門閂鎖住或被鎖住
To shut tightly so that the latch is engaged:
用門閂關緊：關得太緊因而把彈簧鎖撞上了：
例句：
a door too warped to latch.
門彎曲的太厲害而鎖不上

<習慣用語>latch on to 或
latch onto
To get hold of; obtain:
取得；得到：
例句：
latched on to a fortune in the fur trade.
在皮毛生意中賺了一大筆錢

來源：
Middle English latche
中古英語 latche
from lacchen [to seize]
源自 lacchen [抓]
from Old English lôccan
源自 古英語 lôccan