contract verb definition in Materials and properties topic from the Oxford Advanced Learner's Dictionary

contract

 verb: Materials and properties topic
[intransitive, transitive] to become less or smaller; to make something become less or smaller Glass contracts as it cools. The universe is expanding rather than contracting. a contracting market The heart muscles contract to expel the blood. contract something The exercise consists of stretching and contracting the leg muscles. contract something to something ‘I will’ and ‘I shall’ are usually contracted to ‘I'll’ (= made shorter).

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