This is the 7340th most frequent Swedish word.
sima
"Sima" in Swedish refers to a sweet fermented drink, similar to mead, traditionally consumed during Valborg (Walpurgis Night).
Here, 'simningen' is derived from 'sima' (to swim) and represents the act of swimming in a general sense.
Simningen i sjön var lugn och stilla.
Swimming in the lake was calm and still.
The word 'simar' is the verb form of 'sima', indicating the ongoing action of swimming in real-time.
Han simar snabbt genom vågorna.
He swims quickly through the waves.
In this case, 'sima' denotes learning the activity or skill of swimming.