This is the 42nd most frequent Danish word.
skulle
"Skulle" means "should," "shall," or "was/were supposed to" depending on context.
In this sentence, 'skulle' indicates a past obligation or intention that might not necessarily have been fulfilled.
Jeg skulle besøge mine venner i går.
I was supposed to visit my friends yesterday.
Here, 'skal' (present tense of 'skulle') expresses a necessity or obligation.
Du skal tage din medicin hver dag.
You must take your medication every day.
In this case, 'skulle' is used in a hypothetical sense, describing a condition that might occur.