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8 VERB If an event or mistake costs you something, you lose that thing as the result of it. □ [V n n] …a six-year-old boy whose life was saved by an operation that cost him his sight. □ [V n] The increase will hurt small business and cost many thousands of jobs.

9 PHRASE If you say that something must be avoided at all costs , you are emphasizing that it must not be allowed to happen under any circumstances. [EMPHASIS ] □  They told him a disastrous world trade war must be avoided at all costs.

10 PHRASE If you say that something must be done at any cost , you are emphasizing that it must be done, even if this requires a lot of effort or money. [EMPHASIS ] □  This book is of such importance that it must be published at any cost.

11 PHRASE If you say that something costs money , you mean that it has to be paid for, and perhaps cannot be afforded. □  Well-designed clothes cost money.

12 PHRASE If you know something to your cost , you know it because of an unpleasant experience that you have had. □  Kathryn knows to her cost the effect of having served a jail sentence.

13to cost someone dear → see dear

▸  cost out → see cost 4 SYNONYMS cost NOUN 1

price:…a sharp increase in the price of petrol.

worth:I went and bought about six dollars' worth of potato chips.

expense:He's bought a specially big TV at vast expense.

charge:We can arrange this for a small charge.

rate:…specially reduced rates for travellers using Gatwick Airport.

co st ac|count|ing N‑UNCOUNT Cost accounting is the recording and analysis of all the various costs of running a business. [BUSINESS ]

co -star (co-stars , co-starring , co-starred ) in AM, also use costar 1 N‑COUNT [usu poss N ] An actor's or actress's co-stars are the other actors or actresses who also have one of the main parts in a particular film. □  He now lives in Berlin with his co-star from the film.

2 VERB If an actor or actress co-stars with another actor or actress, the two of them have the main parts in a particular film. □ [V + with ] This fall she co-stars in a film with the acclaimed British actor Kenneth Branagh. □ [V + in ] They co-starred in a television version of EM Forster's A Room with a View. □ [V + in ] She revealed the pair were to co-star in an action movie.

3 VERB If a film co-stars particular actors, they have the main parts in it. □ [V n] The film co-stars Dame Helen Mirren, John Malkovich, Sir Anthony Hopkins and Catherine Zeta-Jones.

co st-effe ctive ADJ Something that is cost-effective saves or makes a lot of money in comparison with the costs involved. □  The bank must be run in a cost-effective way. ●  cost-effectively ADV [ADV after v] □  The management tries to produce the magazine as cost-effectively as possible. ●  cost-effectiveness N‑UNCOUNT □ [+ of ] A Home Office report has raised doubts about the cost-effectiveness of the proposals.

cost|ing /kɒ st I ŋ, [AM ] kɔː st-/ (costings ) N‑VAR A costing is an estimate of all the costs involved in a project or a business venture. [mainly BRIT , BUSINESS ] □  We'll put together a proposal, including detailed costings, free of charge. in AM, use costs

cost|ly /kɒ stli, [AM ] kɔː st-/ (costlier , costliest )