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1 N‑UNCOUNT Coal is a hard black substance that is extracted from the ground and burned as fuel. □  Gas-fired electricity is cheaper than coal.

2 N‑PLURAL Coals are burning pieces of coal. □  It is important to get the coals white-hot before you start cooking.

coa|lesce /koʊ əle s/ (coalesces , coalescing , coalesced ) VERB If two or more things coalesce , they come together and form a larger group or system. [FORMAL ] □ [V prep] Cities, if unrestricted, tend to coalesce into bigger and bigger conurbations. □ [V ] His sporting and political interests coalesced admirably in his writing about climbing.

coal|face /koʊ lfe I s/ (coalfaces ) N‑COUNT In a coal mine, the coalface is the part where the coal is being cut out of the rock.

coal|field /koʊ lfiːld/ (coalfields ) N‑COUNT A coalfield is a region where there is coal under the ground. □  The park lies on top of a coalfield.

coa|li|tion ◆◇◇ /koʊ əl I ʃ ^ə n/ (coalitions )

1 N‑COUNT [oft N n] A coalition is a government consisting of people from two or more political parties. □  Since June the country has had a coalition government.

2 N‑COUNT A coalition is a group consisting of people from different political or social groups who are co-operating to achieve a particular aim. □ [+ of ] He had been opposed by a coalition of about 50 civil rights, women's and Latino organizations.

coa l mine (coal mines ) also coalmine N‑COUNT A coal mine is a place where coal is dug out of the ground.

coa l min|er (coal miners ) also coalminer N‑COUNT A coal miner is a person whose job is mining coal.

coa l scut|tle (coal scuttles ) N‑COUNT A coal scuttle is a container for keeping coal in. [mainly BRIT ]

coa l tar also coal-tar N‑UNCOUNT Coal tar is a thick black liquid made from coal which is used for making drugs and chemical products. □  …coal tar dyes.

coarse /kɔː ^r s/ (coarser , coarsest )

1 ADJ Coarse things have a rough texture because they consist of thick threads or large pieces. □  …a jacket made of very coarse cloth. □  …a beach of coarse sand. ●  coarse|ly ADV □  …coarsely-ground black pepper.

2 ADJ If you describe someone as coarse , you mean that he or she talks and behaves in a rude and offensive way. [DISAPPROVAL ] □  The soldiers did not bother to moderate their coarse humour in her presence. ●  coarse|ly ADV [ADV with v] □  The women laughed coarsely at some vulgar joke.

coars|en /kɔː ^r s ^ə n/ (coarsens , coarsening , coarsened )

1 VERB If something coarsens or is coarsened , it becomes thicker or rougher in texture. □ [V ] Skin thickens, dries and coarsens after sun exposure. □ [V -ed] …his gnarled, coarsened features. [Also V n]

2 VERB If someone's behaviour or speech coarsens or if they coarsen it, they become less polite or they begin to speak in a less pleasant way. □ [V ] Her voice has deepened and coarsened with the years. □ [V n] He had coarsened his voice to an approximation of Cockney.

coast ◆◆◇ /koʊ st/ (coasts , coasting , coasted )

1 N‑COUNT [oft adj N ] The coast is an area of land that is next to the sea. □  Campsites are usually situated along the coast, close to beaches. □ [+ of ] …the west coast of Scotland.

2 VERB If a vehicle coasts somewhere, it continues to move there with the motor switched off, or without being pushed or pedalled. □ [V prep/adv] I switched off the engine and coasted round the corner. [Also V ]

3 PHRASE If you say that the coast is clear , you mean that there is nobody around to see you or catch you. □  'You can come out now,' he called. 'The coast is clear. She's gone.'