The difference between Debuff and Improve
When used as verbs, debuff means to make a character or unit weaker, whereas improve means to make (something) better.
Debuff is also noun with the meaning: an effect that makes a game character weaker.
check bellow for the other definitions of Debuff and Improve
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Debuff as a noun (RPG, video games):
An effect that makes a game character weaker; a negative status effect.
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Debuff as a verb (RPG, video games):
To make a character or unit weaker.
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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"