Bests

of the highest quality, excellence, or standing:
the best work; the best students.
most advantageous, suitable, or desirable:
the best way.
largest; most:
the best part of a day.
most excellently or suitably; with most advantage or success:
an opera role that best suits her voice.
in or to the highest degree; most fully (usually used in combination):
best-suited; best-known; best-loved.
something or someone that is best:
they always demand and get the best. the best of us can make mistakes.
a person’s finest clothing:
it’s important that you wear your best.
a person’s most agreeable or desirable emotional state (often preceded by at).
a person’s highest degree of competence, inspiration, etc. (often preceded by at).
the highest quality to be found in a given activity or category of things (often preceded by at):
cabinetmaking at its best.
the best effort that a person, group, or thing can make:
their best fell far short of excellence.
a person’s best wishes or kindest regards:
please give my best to your father.
to get the better of; defeat; beat:
he easily bested his opponent in hand-to-hand combat. she bested me in the argument.
all for the best, for the good as the final result; to an ultimate advantage:
at the time it was hard to realize how it could be all for the best.
also, for the best.
as best one can, in the best way possible under the circ-mstances:
we tried to smooth over the disagreement as best we could.
at best, under the most favorable circ-mstances:
you may expect to be treated civilly, at best.
get / have the best of,

to gain the advantage over.
to defeat; subdue:
his arthritis gets the best of him from time to time.

had best, would be wisest or most reasonable to; ought to:
you had best phone your mother to tell her where you are going.
make the best of, to cope with in the best way possible:
to make the best of a bad situation.
with the best, on a par with the most capable:
he can play bridge with the best.
contemporary examples

why the gop should panic matt latimer november 6, 2011
tea partier matt bevin is selling himself as the anti-mitch mcconnell sam youngman february 7, 2014

historical examples

the man that corrupted hadleyburg and other stories mark twain (samuel clemens)
elsie inglis eva shaw mclaren
what’s wrong with the world g.k. chesterton
the place beyond the winds harriet t. comstock
what’s wrong with the world g.k. chesterton

adjective
the superlative of good
most excellent of a particular group, category, etc
most suitable, advantageous, desirable, attractive, etc
the best part of, most of: the best part of an hour
put one’s best foot forward

to do one’s utmost to make progress
to hurry

adverb
the superlative of well1
in a manner surp-ssing all others; most excellently, advantageously, attractively, etc
(in combination) in or to the greatest degree or extent; most: the best-loved hero
as best one can, as best one may, as effectively as possible within one’s limitations
had best, would be wise, sensible, etc, to: you had best go now
noun
the best, the most outstanding or excellent person, thing, or group in a category
(often preceded by at) the most excellent, pleasing, or skilled quality or condition: journalism at its best
the most effective effort of which a person or group is capable: even their best was inadequate
a winning majority: the best of three games
also all the best. best wishes: she sent him her best
a person’s smartest outfit of clothing
at best

in the most favourable interpretation
under the most favourable conditions

for the best

for an ultimately good outcome
with good intentions: he meant it for the best

get the best of, have the best of, to surp-ss, defeat, or outwit; better
give someone the best, to concede someone’s superiority
make the best of, to cope as well as possible in the unfavourable circ-mstances of (often in the phrases make the best of a bad job, make the best of it)
(informal) six of the best, six strokes with a cane on the b-ttocks or hand
verb
(transitive) to gain the advantage over or defeat
noun
charles herbert. 1899–1978, canadian physiologist: -ssociated with banting and macleod in their discovery of insulin in 1922
george. 1946–2005, northern ireland footballer
adj.

the best-laid schemes o’ mice an’ men
gang aft agley,
an’ lea’e us nought but grief an’ pain,
for promis’d joy!

[burns]

best-seller as short for “best-selling book” is from 1902, apparently originally in the publishing trade; best friend was in chaucer (late 14c.). best girl is first attested 1881, american english; best man is 1814, originally scottish, replacing groomsman. to be able to do something with the best of them is recorded by 1748.
v.
n.
best
(běst)
american-born canadian physiologist who -ssisted frederick banting in the discovery of the hormone insulin. in acknowledgment of his work, banting shared his portion of the 1923 n-bel prize with best. in addition to further refining the use of insulin, best later discovered the vitamin choline and the enzyme histaminase, which breaks down histamine.

best bib and tucker
best of both worlds, the
best part of something
best shot