Something that's upright stands straight up. When you sit upright, your back is straight and vertical. Even your grandmother would approve of your posture.

Most cars have seats that can fold forward or lean back, and then snap upright, back into a normal sitting position; and when you're in class, you're usually expected to sit upright, facing your teacher at the front of the room. Another way to use upright is to mean "upstanding" or "trustworthy," so if your friend finds a wallet full of money and returns it to its owner, you can call her an upright citizen.

Definitions of upright

adj in a vertical position; not sloping

“an upright post”
perpendicular, vertical
at right angles to the plane of the horizon or a base line

adj upright in position or posture

“he sat bolt upright
erect, vertical
capable of being raised to an upright position
having clusters of erect branches (often appearing to form a single column)
pertaining to an upright standing posture
in walking position with right foreleg raised
rampant, rearing
rearing on left hind leg with forelegs elevated and head usually in profile
of plants that are semi-climbers
of plants that are partly erect
of animals that are partly erect
having a supporting base
requiring a standing position
standing on four feet
straight, unbent, unbowed
erect in posture
not upright in position or posture
accumbent, decumbent, recumbent
lying down; in a position of comfort or rest
bended, bent
used of the back and knees; stooped
cernuous, drooping, nodding, pendulous, weeping
having branches or flower heads that bend downward
lying on the stomach with head raised with legs pointed forward
dormant, sleeping
(heraldry) lying with head on paws as if sleeping
flat, prostrate
stretched out and lying at full length along the ground
crooked, hunched, round-backed, round-shouldered, stooped, stooping
having the back and shoulders rounded; not erect
having stems that trail along the ground without putting down roots
prone, prostrate
lying face downward
imperfectly prostrate; prostrate for part of its length
resupine, supine
lying face upward
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adj of moral excellence

“an upright and respectable man”
good, just
characterized by or proceeding from accepted standards of morality or justice

n a vertical structural member as a post or stake

“the ball sailed between the uprights
show 33 types...
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column, pillar
(architecture) a tall vertical cylindrical structure standing upright and used to support a structure
upright consisting of a vertical side member of a door or window frame
an upright consisting of a piece of timber or metal fixed firmly in an upright position
scantling, stud
an upright in house framing
scape, shaft
(architecture) upright consisting of the vertical part of a column
an upright that is a member in a door or window frame
atlas, telamon
a figure of a man used as a supporting column
bitt, bollard
a strong post (as on a wharf or quay or ship for attaching mooring lines)
carrick bitt
either of a pair of strong posts that support a windlass on a ship's deck
a supporting column carved in the shape of a person
corner post
a square post supporting a structural member at the corner of a building
doorjamb, doorpost
a jamb for a door
either of two posts that bound a gate
one of a pair of posts (usually joined by a crossbar) that are set up as a goal at each end of a playing field
hitching post
a fixed post with a ring to which a horse can be hitched to prevent it from straying
hop pole
a tall pole to support the wires on which the hop plant is trained
king post
post connecting the crossbeam to the apex of a triangular truss
a metal post supporting an outdoor lamp (such as a streetlight)
a vertical pole or post decorated with streamers that can be held by dancers celebrating May Day
the central pillar of a circular staircase
newel, newel post
the post at the top or bottom of a flight of stairs; it supports the handrail
a rectangular column that usually projects about a third of its width from the wall to which it is attached
pile, piling, spile, stilt
a column of wood or steel or concrete that is driven into the ground to provide support for a structure
queen post
vertical tie post in a roof truss
rudderpost, rudderstock
a vertical post at the forward edge of a rudder that enables the rudder to pivot
a strong wooden or metal post with a point at one end so it can be driven into the ground
any vertical post or rod used as a support
an upright pole or beam (especially one used as a support)
(cricket) any of three upright wooden posts that form the wicket
support column
a column that supports a heavy weight
telegraph pole, telegraph post, telephone pole
tall pole supporting telephone wires
a post made of wood
whipping post
post formerly used in public to which offenders are tied to be whipped
Type of:
structural member
support that is a constituent part of any structure or building

n a piano with a vertical sounding board

upright piano
a small and compactly built upright piano
Type of:
forte-piano, piano, pianoforte
a keyboard instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds

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