
senkrecht
vertical
Standing at a 90-degree angle to a horizontal line or surface; vertical.
Die Felswand fällt fast senkrecht ins Tal ab.
The rock face drops almost vertically into the valley.
vertical
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vertical
Standing at a 90-degree angle to a horizontal line or surface; vertical.
Die Felswand fällt fast senkrecht ins Tal ab.
The rock face drops almost vertically into the valley.

to take off
An idiom that describes a very fast and successful start to a career.
Nach ihrem Uni-Abschluss ist sie in der neuen Firma direkt senkrecht gestartet.
After graduating from university, she immediately took off at the new company.
The word is derived from 'senken' (to lower something) and 'recht' (in the sense of 'straight'). It describes the direction in which a weight on a string, a plumb bob, falls — that is, straight down.
Ein Lot hängt immer genau senkrecht.
A plumb line always hangs exactly vertically.
'Senkrecht' (vertical/vertically) can stand before a noun as an adjective or function as an adverb describing a movement or position. The form of the word does not change in this use.
Zeichne bitte eine senkrechte Linie auf das Papier.
Please draw a vertical line on the paper.
The idiom 'senkrecht starten' (to take off) is used figuratively for a person who begins an extraordinarily fast and successful career.
Mit ihrer innovativen Idee ist die junge Unternehmerin sofort senkrecht gestartet.
With her innovative idea, the young entrepreneur took off immediately.
across / transverse
Quer describes a direction in relation to the lengthwise direction of an object; the angle can be right or acute. Senkrecht, on the other hand, refers to an exact 90-degree angle to a horizontal line or surface. A vertical line running across something can therefore be described with either word, but they emphasize different aspects.

Eine rote Linie verläuft senkrecht zur waagerechten Unterkante des länglichen Schildes.
A red line runs perpendicular to the horizontal bottom edge of the elongated sign.
Eine rote Linie läuft leicht schräg quer über das längliche Schild.
A red line runs slightly diagonally across the elongated sign.