
horizontal
Horizontal; running parallel to the horizon or a flat surface. The opposite of vertical.
Bitte ziehen Sie eine horizontale Linie von links nach rechts.
Please draw a horizontal line from left to right.
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Horizontal; running parallel to the horizon or a flat surface. The opposite of vertical.
Bitte ziehen Sie eine horizontale Linie von links nach rechts.
Please draw a horizontal line from left to right.

Figuratively, referring to a structure or relationship on the same hierarchical level, for example between departments in a company.
Die horizontale Kommunikation zwischen den Teams muss dringend verbessert werden.
Horizontal communication between the teams urgently needs to be improved.
'Horizontal' (horizontal) can also be used as an adverb without changing form. It then describes how an action is carried out: in a horizontal direction.
Der Balken muss horizontal ausgerichtet werden.
The beam must be aligned horizontally.
The literal meaning can be recognized from words in the fields of geometry, technology, or description. Typical nouns are 'Linie' (line), 'Ebene' (plane), 'Achse' (axis), or 'Position' (position).
Der Patient lag in horizontaler Position auf dem Bett.
The patient lay in a horizontal position on the bed.
The figurative meaning is found in the context of organizations and companies. It is often combined with words such as 'Struktur' (structure), 'Kommunikation' (communication), 'Hierarchie' (hierarchy), or 'Zusammenarbeit' (collaboration).
Das Unternehmen fördert die horizontale Zusammenarbeit zwischen den Abteilungen.
The company promotes horizontal collaboration between the departments.
across / transverse
Quer describes a line in relation to the lengthwise direction of a surface or object. Horizontal describes its level direction relative to the horizon or a flat surface. On a portrait-format poster, both words can fit; what matters is whether the direction within the object or the direction relative to its surroundings is meant.

Auf dem hochformatigen Plakat verläuft eine Linie horizontal von links nach rechts.
On the portrait-format poster, a line runs horizontally from left to right.
Auf dem hochformatigen Plakat verläuft eine Linie quer von links nach rechts.
On the portrait-format poster, a line runs across it from left to right.