This is the 3656th most frequent Dutch word.
runt
A bovine (cow or ox).
Here, 'rund' is used as a noun referring to cattle, specifically a bovine animal.
Het rund graast in de wei.
The bovine grazes in the pasture.
In this example, 'rund' is used colloquially as an insult, implying someone is behaving foolishly or clumsily.
Hij gedraagt zich als een rund als hij boos is.
He behaves like a fool when he’s angry.
Here, 'rund' acts as the root in a compound word 'rundvlees', which means 'beef'. It refers to the meat obtained from cattle.