The difference between Improve and Worsen
When used as verbs, improve means to make (something) better, whereas worsen means to make worse.
check bellow for the other definitions of Improve and Worsen
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Improve as a verb (transitive):
To make (something) better; to increase the value or productivity (of something).
Examples:
"Painting the woodwork will improve this house."
"Buying more servers would improve performance."
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Improve as a verb (intransitive):
To become better.
Examples:
"I have improved since taking the tablets."
"The error messages have improved since the last version, when they were incomprehensible."
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Improve as a verb (obsolete):
To disprove or make void; to refute.
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Improve as a verb (obsolete):
To disapprove of; to find fault with; to reprove; to censure.
Examples:
"to improve negligence"
"rfquotek Chapman"
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Improve as a verb (dated):
To use or employ to good purpose; to turn to profitable account.
Examples:
"to improve one's time;  to improve his means"
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Worsen as a verb (transitive):
To make worse; to impair.
Examples:
"The global warming has worsened the weather."
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Worsen as a verb (intransitive):
To become worse; to get worse.
Examples:
"The weather has worsened."
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Worsen as a verb (transitive, obsolete):
To get the better of; to worst.