IPA: /ˈdɛθˌwɒtʃ/
KK: /ˈdɛθˌwɑtʃ/
A vigil or watch kept beside a dying or dead person, often to show respect or to keep guard.
The family held a deathwatch by the bedside of their loved one.
Deathwatch is formed from "death" (from Old English "deað", meaning the end of life) and "watch" (from Old English "wæccan", meaning to be awake or to guard). The term refers to a vigil kept by those who watch over a dying person or the act of keeping watch during a time of death.
Think of keeping a 'watch' over someone who is at the 'end of life' — that's why 'deathwatch' refers to the vigil kept during this time.
No commonly confused words.