The difference between Keep and Preserve
When used as nouns, keep means care, notice, whereas preserve means a sweet spread made of any of a variety of fruits.
When used as verbs, keep means to continue in (a course or mode of action), whereas preserve means to protect.
check bellow for the other definitions of Keep and Preserve
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Keep as a verb:
To continue in (a course or mode of action); not to intermit or fall from; to uphold or maintain.
Examples:
"to keep silence;  to keep one's word;  to keep possession"
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Keep as a verb (transitive):
To hold the status of something. To maintain possession of. To maintain the condition of. To record transactions, accounts, or events in. To enter (accounts, records, etc.) in a book. To remain in, to be confined to. To restrain. To watch over, look after, guard, protect. To supply with necessities and financially support a person. To raise; to care for. To maintain (an establishment or institution); to conduct; to manage. To have habitually in stock for sale.
Examples:
"I keep a small stock of painkillers for emergencies."
"I keep my specimens under glass to protect them."
"The abundance of squirrels kept the dogs running for hours."
"I used to keep a diary."
"I keep my brother out of trouble by keeping him away from his friends and hard at work."
"May the Lord keep you from harm."
"He kept a mistress for over ten years."
"He has been keeping orchids since retiring."
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Keep as a verb (intransitive):
To hold or be held in a state. To reside for a time; to lodge; to dwell. To continue. To remain edible or otherwise usable. To remain in a state.
Examples:
"She kept to her bed while the fever lasted."
"I keep taking the tablets, but to no avail."
"Potatoes can keep if they are in a [[root cellar]]."
"Latex paint won't keep indefinitely."
"The rabbit avoided detection by keeping still."
"'Keep calm! There's no need to panic."
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Keep as a verb (obsolete):
To wait for, keep watch for.
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Keep as a verb (intransitive, cricket):
To act as wicket-keeper.
Examples:
"Godfrey Evans kept for England for many years."
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Keep as a verb (intransitive, obsolete):
To take care; to be solicitous; to watch.
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Keep as a verb (intransitive, obsolete):
To be in session; to take place.
Examples:
"School keeps today."
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Keep as a verb (transitive):
To observe; to adhere to; to fulfill; not to swerve from or violate.
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Keep as a verb (transitive, dated):
To confine oneself to; not to quit; to remain in.
Examples:
"to keep one's house, room, bed, etc."
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Keep as a verb (transitive, dated, by extension):
To visit (a place) often; to frequent.
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Keep as a noun (obsolete):
Care, notice
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Keep as a noun (historical):
The main tower of a castle or fortress, located within the castle walls.
Examples:
"synonyms: donjon"
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Keep as a noun:
The food or money required to keep someone alive and healthy; one's support, maintenance.
Examples:
"He works as a cobbler's apprentice for his keep."
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Keep as a noun:
The act or office of keeping; custody; guard; care; heed; charge.
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Keep as a noun:
The state of being kept; hence, the resulting condition; case.
Examples:
"to be in good keep'"
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Keep as a noun (obsolete):
That which is kept in charge; a charge.
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Keep as a noun (engineering):
A cap for holding something, such as a journal box, in place.
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Preserve as a noun:
A sweet spread made of any of a variety of fruits.
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Preserve as a noun:
A reservation, a nature preserve.
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Preserve as a noun:
An activity with restricted access.
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Preserve as a verb:
To protect; to keep from harm or injury.
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Preserve as a verb:
To save from decay by the use of some preservative substance, such as sugar or salt; to season and prepare (fruits, meat, etc.) for storage.
Examples:
"to preserve peaches or grapes"
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Preserve as a verb:
To maintain throughout; to keep intact.
Examples:
"to preserve appearances; to preserve silence"