This is the 2616th most frequent Swedish word.
rest
Remaining part; leftover.
Here, 'rest' refers to a remainder or leftover of something.
Jag har en liten kaka som är en rest från gårdagens fika.
I have a small cookie that is leftover from yesterday's coffee break.
In this case, 'rest' is used as a noun meaning a journey or trip, although grammatically it would be more common to use 'resa' in Swedish.
Under semestern älskar jag att för en lång rest till fjällen.
During the vacation, I love to take a long trip to the mountains.
In this instance, 'rest' indicates relaxation or a pause from activity.