Colloquial for ruining, spoiling, or making something go badly. It can refer to plans, moods, objects, or exams.
example
Mit deiner schlechten Laune versaust du uns den ganzen Abend.
With your bad mood, you're messing up the whole evening for us.
Usage tips
Word structure
The word is made up of the prefix 'ver-' and the word 'sauen'. 'Sauen' derives from 'die Sau' (sow/pig) and means to make a big mess. The prefix 'ver-' intensifies the negative meaning here.
EXAMPLE
Pass auf, dass du mit dem Saft nicht den neuen Teppich versaust!
Be careful not to mess up the new carpet with the juice!
Register: colloquial language
'Versauen' (to mess up / soil) is a strongly colloquial word. In formal situations, such as in an official letter or a presentation, you should avoid it.
EXAMPLE
Ich habe die Prüfung total versaut.
I totally messed up the exam.
Inseparable verb
The prefix 'ver-' is inseparable. It stays firmly attached to the verb in all sentence forms and tenses.
EXAMPLE
Er hat mir die ganze Überraschung versaut.
He messed up the whole surprise for me.
Typical collocations
When something is ruined, typical objects are abstract nouns: 'die Stimmung versauen' (to ruin the mood), 'eine Prüfung versauen' (to mess up an exam), 'einen Plan versauen' (to mess up a plan), or 'den Appetit versauen' (to ruin someone's appetite).
EXAMPLE
Der Regen hat uns den ganzen Ausflug versaut.
The rain messed up the whole outing for us.
Context clue
In the meaning 'schmutzig machen' (to make dirty), 'versauen' (to soil) always refers to concrete things or places. Typical objects are 'die Kleidung' (clothing), 'das Hemd' (the shirt), 'die Küche' (the kitchen), or 'den Boden' (the floor).
EXAMPLE
Beim Malen habe ich mir meine ganze Hose versaut.
While painting, I soiled my entire pair of pants.
Compare with
antonym
versauen vs retten
to save / rescue
'retten' and 'versauen' can be opposites when the outcome of a situation is involved. 'retten' means to rescue someone or something from danger, or to save something from failure. 'versauen' means, colloquially, to ruin something or make it turn out badly. 'retten' sounds neutral and can be used in serious situations. 'versauen' is more everyday language and fits plans, moods, exams, or similar things. In short: someone who 'rettet' something prevents the damage; someone who 'versaut' something causes or increases the damage.
versauen
Mit seiner schlechten Laune hat Paul fast den ganzen Abend versaut.
With his bad mood, Paul almost ruined the whole evening.
retten
Mina rettet die Präsentation, weil sie die fehlenden Zahlen schnell findet.
Mina saves the presentation because she quickly finds the missing figures.