adjective
horizontal
B1
Waagerecht: 'horizontal', used as an adjective meaning level or parallel to the horizon. Gradable (comparative waagerechter; superlative am waagerechtsten). It's synonymous with waagrecht; antonym senkrecht. No reflexivity or special preposition. Common in everyday speech and technical measurements describing orientation in German.
Examples
Das Bild hängt waagerecht an der Wand.
The picture is hanging level on the wall.
Die Techniker stellten die Regale waagerecht auf, damit die Regalböden nicht kippten.
The technicians set the shelves horizontally so that the shelf boards did not tip.
Details
Mnemonics
Picture the bubble in a carpenter's spirit level centered — that shows 'waagerecht'.
Sounds a bit like 'wagon right' — imagine a wagon that stays perfectly level.
Notes
Commonly used to describe something that is parallel to the horizon or perfectly level. Predominantly neutral/register; often used in technical and everyday contexts.