This is the 2536th most frequent Swedish word.
längst
"Längst" means "furthest" or "longest" in English.
The word 'längst' is used here as an adverb indicating the farthest distance in a spatial context.
Hon sprang längst på maratonet.
She ran the furthest in the marathon.
In this sentence, 'längst' serves as an adverb describing the position at the greatest distance spatially.
Boken låg längst bort på bordet.
The book was situated furthest away on the table.
Here, 'längst' is used as an adverb describing the greatest duration in time.