IPA: /ˈmɪdˌwɒtʃ/
KK: /mɪdˌwɑtʃ/
A period of time during the night when someone is on duty, typically from midnight to 8 a.m.
The sailors took turns standing the midwatch to ensure the ship was safe during the night.
Midwatch → It is formed from "mid" (from Old English "mid", meaning middle) and "watch" (from Old English "wæccan", meaning to be awake or to watch). The term "midwatch" refers to the middle period of a watch, particularly in naval contexts, when sailors are on duty during the night.
Think of being in the 'middle' ('mid') of a 'watch' — that's why midwatch refers to the middle period of duty.
No commonly confused words.