die Sau
sow
A female domestic pig, especially one that has already given birth to piglets.
Auf dem Bauernhof hat die Sau letzte Woche zehn Ferkel bekommen.
On the farm, the sow had ten piglets last week.

sow / pig
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sow
A female domestic pig, especially one that has already given birth to piglets.
Auf dem Bauernhof hat die Sau letzte Woche zehn Ferkel bekommen.
On the farm, the sow had ten piglets last week.

Apart from the meanings as an animal and as a playing card, 'Sau' (sow/pig) is used in most expressions as crude colloquial language. You should use the word only in very informal situations and with caution.
Sein Verhalten war wirklich unter aller Sau.
His behavior was really absolutely awful.
The prefix 'sau-' is used colloquially to intensify adjectives or adverbs, similar to 'very'. It is considered crude and very informal.
Zieh dich warm an, draußen ist es saukalt.
Dress warmly; it's damn cold outside.
The expression 'keine Sau' (not a soul / nobody) is a very colloquial and crude way to say 'niemand' (nobody). It is often used to express annoyance or frustration.
Ich habe stundenlang aufgeräumt, aber keine Sau hat es bemerkt.
I cleaned up for hours, but not a soul noticed.
The expression 'unter aller Sau' (absolutely awful / below all standards) means that something or someone is of extremely poor quality or unacceptable. The phrase is very colloquial.
Der Service in diesem Hotel war unter aller Sau.
The service in this hotel was absolutely awful.
When someone 'die Sau rauslässt' (lets loose), that person celebrates very wildly and without restraint. This expression is informal and is often used in connection with parties.
Nach der Arbeit lassen wir heute Abend mal richtig die Sau raus!
After work tonight, we're really going to let loose!
In certain German card games such as Skat or Schafkopf, 'die Sau' is the colloquial name for the highest card, the ace. Outside this context, this meaning is not understood.
Mit der Gras-Sau hat er den letzten Stich gemacht.
With the ace of leaves, he took the last trick.
pig
'die Sau' and 'das Schwein' can both refer to an animal, and both can also be used insultingly for a person. 'Das Schwein' is the general word for the animal and also for the meat. 'Die Sau' is more specific: it means a female pig, especially a mother animal. As an insult, 'Sau' is very crude and coarse, while 'Schwein' is also insulting but somewhat more general. Learners may confuse the words because in everyday language they are both connected with the same animal. For the animal in general, 'Schwein' is usually the safe choice.

Auf dem Bauernhof liegt die Sau mit ihren Ferkeln im Stroh.
On the farm, the sow is lying in the straw with her piglets.
Das Kind füttert das Schwein mit Kartoffeln.
The child feeds the pig potatoes.