This is the 240th most frequent Norwegian word.
så
The Norwegian word "så" can mean "so," "then," "saw," or "sewed," depending on context.
In this sentence, 'så' is used as the past tense of the verb 'å se', meaning 'to see'.
Jeg så filmen i går kveld.
I saw the movie last night.
Here, 'så' is a conjunction meaning 'so' or 'therefore', introducing the result of a stated condition.
Det var veldig kaldt, så jeg tok på meg en jakke.
It was very cold, so I put on a jacket.
In this case, 'så' functions as an adverb meaning 'so', intensifying the adjective 'tired'.