Definition of onset in English:


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  • 1The beginning of something, especially something unpleasant.

    ‘the onset of winter’
    • ‘Already this year, the number of deaths has reached 32 and emergency chiefs fear the onset of poor winter weather may bring more.’
    • ‘The onset of winter appears to have been delayed, throwing many plants into confusion.’
    • ‘The parents said they then witnessed a regression in their children's behaviour and speech, as well as the onset of an unpleasant bowel disorder.’
    • ‘The fish on Maple Lake at the Oaks are starting to shoal up in the deeper water with the onset of winter.’
    • ‘Physically and mentally frail, he is considered incapable of penning his own memoirs and is said to have only limited capacity for spilling his story owing to the onset of dementia.’
    • ‘The country is also bracing itself for the onset of winter, with temperatures expected to plummet tomorrow and hover just above freezing on December 25.’
    • ‘Many patients trace the onset of IBS to episodes of gastro intestinal infections, gastro intestinal surgery or severe stress.’
    • ‘Autumn is the traditional time for planting because at this time of year, the soil is still warm, allowing plants to settle and even establish a little before the onset of winter.’
    • ‘However in some patients, the onset of symptoms is sudden; this is usually seen in patients with a neurological basis for their illness.’
    • ‘This year that week was September 20-26, to allow for applications to be processed in time for the onset of the British winter.’
    • ‘Some of those that survive the summer do not grow large enough to leave with their parents on the fall migration, and die with the onset of winter.’
    • ‘If the fish have got used to the sudden onset of winter that arrived unannounced last week, then some good sport can be expected from the roach population of the waters below the city.’
    • ‘Normally, an extended period of milder weather which delays the onset of winter's extremes would be seen as a cause for heartfelt celebration.’
    • ‘The mischief makers achieved their target as they hogged the headlines in the wake of the traditional celebration to mark the onset of winter.’
    • ‘But whatever happens with the clocks, I guess few things can help the slow onset of the winter blues.’
    • ‘At that point, a number of drugs in clinical trials could be administered that may postpone or perhaps prevent the onset of dementia.’
    • ‘For many patients the onset of EPS is gradual, and if it occurs, can be treated with anticholinergic medication.’
    • ‘He has produced a set of seven steps to keep your mind nimble, steps which may even postpone the onset of dementia, but which at least will probably give your mind a lift.’
    • ‘At least five per cent of all MS patients experience the onset of their disease before the age of 18.’
    • ‘One patient had a late onset of respiratory failure at 144 hours after surgery.’
    start, beginning, arrival, appearance, first appearance, opening, outset, inception
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    1. 1.1 archaic A military attack.
      attack, assault, offensive, onslaught, offence, drive, push, thrust, onrush, sortie, sally, swoop, foray, raid, invasion, incursion, campaign
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/ˈänˌset/ /ˈɑnˌsɛt/ /ˈônˌset/ /ˈɔnˌsɛt/