The difference between Deteriorate and Improve
When used as verbs, deteriorate means to make worse, whereas improve means to make (something) better.
check bellow for the other definitions of Deteriorate and Improve
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Deteriorate as a verb (transitive):
To make worse; to make inferior in quality or value; to impair.
Examples:
"to deteriorate the mind"
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Deteriorate as a verb (intransitive):
To grow worse; to be impaired in quality; to degenerate.
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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"