n.[C]

1. 閂；門閂；窗閂
   The repairman installed an iron latch on the door.

   修理工在門上安了鐵門閂。

2. 碰鎖，彈簧鎖

vt.

1. 用閂把……閂上；用碰鎖把……鎖上
   Don't forget to latch the door before you go to bed.

   睡覺前別忘了閂門。

vi.

1. 閂上；用碰鎖鎖上

vi.

1. 抓住；佔有；理解[（+on/upon）]
   John was very lucky to have latched onto the office with a river view.

   約翰非常幸運，佔了一間能看到河的辦公室。

n.

1. a bar with a catch and lever used for fastening a door or gate.
2. a spring lock for an outer door, which catches when the door is closed and can only be opened from the outside with a key.
3. Electronics  a circuit which retains whatever output state results from a momentary input signal until reset by another signal.

v.

1. fasten with a latch.
2. Electronics  (of a device) become fixed in a particular state.
3. (latch on) informal understand the meaning of something.
4. (latch on to) informal attach oneself to (someone) as a constant companion.
   ▸take up (an idea or trend) enthusiastically.
5. (latch on) (of a breastfeeding baby) manage to get its mouth into the correct position around the nipple.