This is the 2412th most frequent Swedish word.
förlänger
"Förlänger" means "extends" or "prolongs" in English.
The word 'förlänger' in this sentence is used to describe a physical action of increasing the length of a tangible object, the string.
Jag förlänger snöret så att det räcker längre.
I lengthen the string so that it extends further.
Here, 'förlänger' indicates an extension in duration or continuation of time, referring to a conceptual increase in the lifespan.
Medicinen förlänger patientens liv ett par år.
The medicine prolongs the patient's life by a couple of years.
In this case, 'förlänger' is used to signify an intentional extension of a time-bound activity.