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Từ điển Oxford Advanced Learner 8th
spiral
spiral [spiral spirals spiralled spiraled spiralling spiraling] noun, adjective, verb BrE [ˈspaɪrəl] NAmE [ˈspaɪrəl]
noun
1. a shape or design, consisting of a continuous curved line that winds around a central point, with each curve further away from the centre
•The birds circled in a slow spiral above the house.
•A spiral of smoke rose from the chimney.
2. a continuous harmful increase or decrease in sth, that gradually gets faster and faster
•the destructive spiral of violence in the inner cities
•measures to control the inflationary spiral
•the upward/downward spiral of sales
•the vicious spiral of rising wages and prices
Word Origin:
mid 16th cent. (as an adjective): from medieval Latin spiralis, from Latin spira ‘coil’, from Greek speira ‘a coil’.
Example Bank:
•The economy continued its downward spiral.
•There is a risk that the policy may trigger an inflationary spiral.
•to halt the vicious downward spiral of drug abuse
•How can we halt the destructive spiral of violence in the inner cities?
•The book gives a harrowing account of a downward spiral of drink, drugs and despair.
•The country is caught in a vicious spiral of rising wages and prices.
Derived Word: ↑spirally
Derived: ↑spiral down
adjective
moving in a continuous curve that winds around a central point
•A snail's shell is spiral in form.
Word Origin:
mid 16th cent. (as an adjective): from medieval Latin spiralis, from Latin spira ‘coil’, from Greek speira ‘a coil’.
verb (-ll-, NAmE usually -l-)
1. intransitive (+ adv./prep.) to move in continuous circles, going upwards or downwards
•Smoke spiralled into the sky.
•The plane spiralled down to the ground.
2. intransitive to increase rapidly
•the spiralling cost of health care
•+ adv./prep. Prices are spiralling out of control.
Verb forms: 
Word Origin:
mid 16th cent. (as an adjective): from medieval Latin spiralis, from Latin spira ‘coil’, from Greek speira ‘a coil’.
Example Bank:
•Shares in the company continued to spiral downwards.
•You must be aware of the spiralling cost of health care in this country.
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