Horizontal (left to right)
There is no "Opposite" to horizontal.
However "Vertical" is perpendicular to horizontal.
Horizontal (left to right or the "x axis" on a grid)
Vertical (up to down or the "y axis" on a grid)
The opposite of "left to right" is "right to left."
the opposite of y is -y
Horizontal (side-to-side) is the "opposite" or rather the perpendicular to vertical (up and down).
Not perpendicular.
Parallel lines cannot be perpendicular to each other, so parallel is close to an opposite.
downright
crossways
The opposite action of recline (lay back) would be to sit up.The opposite action of recline (lay down) would be to stand.The opposite position of reclined could be upright.
They would be brace, buttress, caryatid, colonnade, cylinder, mast, minaret, monolith, monument, obelisk, pedestal, peristyle, pier, pilaster, post, prop, pylon, shaft, standard, stay, stele, support, totem, tower, underpinning and upright.
Upright.
gnomon
Bipedal.
The opposite of crooked or criminal is upright or law-abiding.
The opposite of "nefarious" (wicked or evil) would be good, honorable, virtuous, decent, or upright.
simple: gravity :) ~Drama Dudet
The opposite action of recline (lay back) would be to sit up.The opposite action of recline (lay down) would be to stand.The opposite position of reclined could be upright.
A vessel is stiff when its center of gravity is low, making it careen with difficulty. It returns rapidly to the upright position, with greater force. Opposite of TENDER. A vessel is tender when its center of gravity is high, making it careen easily, i.e., it is topheavy. It returns slowly to the upright position, with relatively little force. The opposite of Stiff.
Meaning of upright image
the first subhuman to walk upright was Homoerectus (Upright Man).
They would be brace, buttress, caryatid, colonnade, cylinder, mast, minaret, monolith, monument, obelisk, pedestal, peristyle, pier, pilaster, post, prop, pylon, shaft, standard, stay, stele, support, totem, tower, underpinning and upright.
Upright = Yashar
upright
For a right-handed golfer, the ball would tend to move to the left. Lie angles that are too upright will cause draws or hooks and angles that are too flat will cause fades or slices. The opposite would be true for left-handed golfers.
upright