cinder
/ˈsɪndə(r); `sɪndɚ/ n
1 [C] small piece of partly burnt coal, wood, etc that is no longer burning but may still be hot 煤渣, 炭渣, 炉渣等（不再燃烧但仍可能有余热）.
2 cinders [pl]
ashes 灰.
3 (idm 习语) burn, etc sth to a `cinder cook (food) until it is hard and black 将（食物）做胡
The cakes were burnt to a cinder. 饼烤胡了.