This is the 52nd most frequent Swedish word.
allt
"Allt" means "everything" or "all" in English.
The word 'allt' here is used as a pronoun referring to 'everything', indicating the entirety of knowledge or information about a specific topic.
Jag vill veta allt om det här.
I want to know everything about this.
In this sentence, 'allt' is used metaphorically to mean 'everything in general' or 'the situation as a whole', affecting the person's feelings.
Allt känns bättre nu när solen skiner.
Everything feels better now that the sun is shining.
Here, 'allt' functions as a determiner equivalent to 'all' in English, specifying the total amount of what was needed to be spoken.