Basic Guidelines For English Spellings
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See US English definition of improve
See UK English definition of improve
See Spanish definition of mejorar
1‘staff looked for ways to improve the service’
worsen, impair
2‘communications improved during the 18th century’
worsen, deteriorate
3‘the dose is not repeated for as long as the patient continues to improve’
deteriorate, become ill
4‘resources are needed to improve the offer’
decrease
‘I cannot improve on his comments’