The difference between Drain and Leech
When used as nouns, drain means a conduit allowing liquid to flow out of an otherwise contained volume, whereas leech means an aquatic blood-sucking annelid of class hirudinea, especially .
When used as verbs, drain means to lose liquid, whereas leech means to apply a leech medicinally, so that it sucks blood from the patient.
check bellow for the other definitions of Drain and Leech
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Drain as a noun (chiefly, US, Canada):
A conduit allowing liquid to flow out of an otherwise contained volume; a plughole
Examples:
"The drain in the kitchen sink is clogged."
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Drain as a noun (chiefly, UK):
An access point or conduit for rainwater that drains directly downstream in a (drainage) basin without going through sewers or water treatment in order to prevent or belay floods.
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Drain as a noun:
Something consuming resources and providing nothing in return.
Examples:
"That rental property is a drain on our finances."
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Drain as a noun (vulgar):
An act of urination.
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Drain as a noun (electronics):
One terminal of a field effect transistor (FET).
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Drain as a noun (pinball):
An outhole.
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Drain as a noun (slang, dated):
A drink.
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Drain as a verb (intransitive):
To lose liquid.
Examples:
"The clogged sink drained slowly."
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Drain as a verb (intransitive):
To flow gradually.
Examples:
"The water of low ground drains off."
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Drain as a verb (transitive, ergative):
To cause liquid to flow out of.
Examples:
"Please drain the sink. It's full of dirty water."
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Drain as a verb (transitive, ergative):
To convert a perennially wet place into a dry one.
Examples:
"They had to drain the swampy land before the parking lot could be built."
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Drain as a verb (transitive):
To deplete of energy or resources.
Examples:
"The stress of this job is really draining me."
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Drain as a verb (transitive):
To draw off by degrees; to cause to flow gradually out or off; hence, to exhaust.
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Drain as a verb (transitive, obsolete):
To filter.
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Drain as a verb (intransitive, pinball):
To fall off the bottom of the playfield.
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Leech as a noun:
An aquatic blood-sucking annelid of class Hirudinea, especially .
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Leech as a noun (figuratively):
A person who derives profit from others in a parasitic fashion.
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Leech as a noun (medicine, dated):
A glass tube designed for drawing blood from damaged tissue by means of a vacuum.
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Leech as a verb (transitive):
To apply a leech medicinally, so that it sucks blood from the patient.
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Leech as a verb (transitive):
To drain (resources) without giving back.
Examples:
" Bert leeched hundreds of files from the BBS, but never uploaded anything in return."
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Leech as a noun (archaic):
A physician.
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Leech as a noun (paganism, Heathenry):
A healer.
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Leech as a verb (archaic, rare):
To treat, cure or heal.
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Leech as a noun (nautical):
The vertical edge of a square sail.
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Leech as a noun (nautical):
The aft edge of a triangular sail.