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1 ADJ If you say that something is costly , you mean that it costs a lot of money, often more than you would want to pay. □  Having professionally-made curtains can be costly, so why not make your own?

2 ADJ If you describe someone's action or mistake as costly , you mean that it results in a serious disadvantage for them, for example the loss of a large amount of money or the loss of their reputation. □  Psychometric tests can save organizations from grim and costly mistakes.

co st of li v|ing N‑SING The cost of living is the average amount of money that people in a particular place need in order to be able to afford basic food, housing, and clothing. □  Companies are moving jobs to towns with a lower cost of living.

co st-plu s ADJ [ADJ n] A cost-plus basis for a contract about work to be done is one in which the buyer agrees to pay the seller or contractor all the cost plus a profit. □  All vessels were to be built on a cost-plus basis.

co st pri ce (cost prices ) N‑VAR [oft at N ] If something is sold at cost price , it is sold for the same price as it cost the seller to buy it. [BRIT ] □  …a factory shop where you can buy very fashionable shoes at cost price.

cos|tume /kɒ stjuːm, [AM ] -tuːm/ (costumes )

1 N‑VAR An actor's or performer's costume is the set of clothes they wear while they are performing. □  Even from a distance the effect of his fox costume was stunning. □  The performers, in costume and make-up, were walking up and down backstage. □  In all, she has eight costume changes.

2 N‑UNCOUNT The clothes worn by people at a particular time in history, or in a particular country, are referred to as a particular type of costume . □  …men and women in eighteenth-century costume.

3 ADJ [ADJ n] A costume play or drama is one which is set in the past and in which the actors wear the type of clothes that were worn in that period. □  …a lavish costume drama set in Ireland and the U.S. in the 1890s.

co s|tume jew|el|lery in AM, use costume jewelry N‑UNCOUNT Costume jewellery is jewellery made from cheap materials.

cos|tum|er /kɒ stjuːmə ^r / (costumers ) N‑COUNT A costumer is the same as a costumier . [AM ]

cos|tumi|er /kɒstjuː miə ^r , [AM ] -tuː -/ (costumiers ) N‑COUNT A costumier is a person or company that makes or supplies costumes. [mainly BRIT ] □  …a theatrical costumier. in AM, use costumer

cosy /koʊ zi/ (cosier , cosiest ) in AM, use cozy 1 ADJ A house or room that is cosy is comfortable and warm. □  Downstairs there's a breakfast room and guests can relax in the cosy bar. ●  co|si|ly /koʊ z I li/ ADV □  We took time to relax in the cosily-decorated drawing room.

2 ADJ [v-link ADJ ] If you are cosy , you are comfortable and warm. □  They like to make sure their guests are comfortable and cosy. ●  co|si|ly ADV [ADV after v] □  He was settled cosily in the corner with an arm round Lynda.

3 ADJ You use cosy to describe activities that are pleasant and friendly, and involve people who know each other well. □  …a cosy chat between friends. ●  co|si|ly ADV [ADV with v] □  …chatting cosily with friends over coffee.

cot /kɒ t/ (cots )

1 N‑COUNT A cot is a bed for a baby, with bars or panels round it so that the baby cannot fall out. [BRIT ] in AM, use crib 2 N‑COUNT A cot is a narrow bed, usually made of canvas fitted over a frame which can be folded up. [AM ] in BRIT, use camp bed

co t death (cot deaths ) N‑VAR Cot death is the sudden death of a baby while it is asleep, although the baby had not previously been ill. [BRIT ] in AM, use crib death