What is the meaning of Cinder?

Partially or mostly burnt material that results from incomplete combustion of coal or wood etc.; it often rides the rising smoke column into the air, and it can pose a fire hazard when it lands, in dry conditions

An ember.

Slag from a metal furnace.

Any strong stimulant added to tea, soda water, etc.

To reduce to cinders.

To cover with cinders.

Source: wiktionary.org