plant part that uses or stores more energy than it produces (contrast with source).

Merriam-Webster Online Dictionary
sink (verb)
intransitive verb
a) to go to the bottom - submerge
b) to become partly buried (as in mud)
c) to become engulfed
a) (1) to fall or drop to a lower place or level
(2) to flow at a lower depth or level
(3) to burn with lower intensity
(4) to fall to a lower pitch or volume - his voice sank to a whisper
b) to subside gradually - settle
c) to disappear from view
d) to slope gradually - dip
a) to soak or become absorbed - penetrate
b) to become impressively known or felt - the lesson had sunk in
to become deeply absorbed - sank into reverie
a) to go downward in quality, state, or condition
b) to grow less in amount or worth
a) to fall or drop slowly for lack of strength
b) to become depressed
transitive verb
c) to fail in health or strength , broadly - fail
a) to cause to sink - sink a battleship
b) to force down especially below the earth's surface
c) to cause (something) to penetrate
- immerse absorb he sank himself into his studies
a) to dig or bore (a well or shaft) in the earth - excavate
b) to form by cutting or excising - sink words in stone
to cast down or bring to a low condition or state - overwhelm defeat
to lower in standing or reputation - abase
a) to lessen in value or amount
b) to lower or soften (the voice) in speaking
- restrain suppress sinks her pride and approaches the despised neighbor Richard Harrison
to pay off (as a debt) - liquidate
- invest
- drop sink a putt sink a jump shot
chiefly British to drink down completely
sink (noun)
a) a pool or pit for the deposit of waste or sewage - cesspool
b) a ditch or tunnel for carrying off sewage - sewer
c) a stationary basin connected with a drain and usually a water supply for washing and drainage
a place where vice, corruption, or evil collects
- sump
a) a depression in the land surface , especially one having a saline lake with no outlet
b) - sinkhole
a body or process that acts as a storage device or disposal mechanism as
a) - heat sink , broadly a device that collects or dissipates energy (as radiation)
b) a reactant with or absorber of a substance - forests are a sink for carbon dioxide
sink (Wikipedia)
A sink/basin in a bathroom

A sink — also known by other names including sinker, washbowl, hand basin and wash basin—is a bowl-shaped plumbing fixture used for washing hands, dishwashing, and other purposes. Sinks have taps (faucets) that supply hot and cold water and may include a spray feature to be used for faster rinsing. They also include a drain to remove used water; this drain may itself include a strainer and/or shut-off device and an overflow-prevention device. Sinks may also have an integrated soap dispenser. Many sinks, especially in kitchens, are installed adjacent to or inside a counter.

When a sink becomes clogged, a person will often resort to use a chemical drain cleaner or a plunger, though most professional plumbers will remove the clog with a drain auger (often called a "plumber's snake").

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