棺: coffin

棺 guān

noun
: coffin

ひつぎ hitsugi

noun
: coffin; casket

棺材 guan1cai: coffin

棺木 guan1mu4: coffin

棺材瓤子 guan1cai rang2zi: geezer with one foot in the grave (used jokingly or as an imprecation)

甕[瓮]棺 weng4guan1: funerary urn

石棺 shi2guan1: sarcophagus

Japanese expression / idiom
棺を蓋いて事定まる | かんをおおいてことさだまる kan o ooite kotosadamaru
: a person’s worth is assessed only when their coffin is sealed

Chinese idiom /proverb
蓋棺論定 [盖棺论定] gai4 guan1 lun4 ding4
: definitive conclusion on the coffin lid: You can only judge a person’s merits or demerits after death. Don’t pass judgment until you’ve seen the end

不見棺材不落淚 [不见棺材不落泪] bu4 jian4 guan1 cai5 bu4 luo4 lei4
: lit. not to shed a tear until one sees the coffin: fig. refuse to be convinced until one is faced with grim reality