You're referring to the word 'plumb' - as in plumb line.
The likely word is spelled vertically ("going straight up").
you spell it plumb
une prune (fem.)
Vertically means straight up and down. Drapes hang vertically. A flag pole is vertical.
Vertical means straight up and down,aligned with the direction of gravity. Vertically upward means vertical in the up direction. So if you jump directly straight up that is vertically upward; when you land you are travelling vertically downward.
That is the correct spelling of "damson" (a variety of plum).
Moving directly straight either horizontally or vertically. As if walking on a straight line.
You jump straight up in the air
The plumb line is a vertical straight line.
You hold straight up; but if you want to type with a landscape keyboard you hold it straight across.
The letters 'somand' spell nomads and damson (a type of plum).
That is the correct spelling of "up." Synonyms include the adjective "vertical" and the adverb "vertically."