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Definition tighten in British English

tighten verb

verb
/ˈtaɪt(ə)n/
1

to turn something such as a screw or a lid until it is tight and you cannot turn it any more

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2

to pull something such as a rope or a belt until it is straighter or until it fits more tightly around something

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2.1

if something such as a rope or a chain tightens, it becomes straighter or it fits more tightly around something

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3

if a muscle or a part of your body tightens, or if you tighten it, it becomes hard and stiff, often because you are angry or afraid

Example

Her stomach tightened, anticipating the fight that was to come.

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3.1

if your mouth tightens, or if your lips tighten, your mouth looks narrow because you are angry or annoyed

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4

if your hand tightens, or if your fingers tighten, you hold something more tightly

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5

to make a set of rules stricter or harder to avoid

Example

a bill that will tighten trading rules

Example

The government wants to tighten its control on the press.

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5.1

to make an arrangement for guarding or protecting something more effectively

Example

Security at foreign consulates was tightened after the attack.

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Definition tighten in British English