This is the 5467th most frequent Dutch word.
loose
The Dutch word "los" means "loose," "free," or "detached" in English.
The word 'los' here is used as an adjective to describe the physical state of the button not being firmly attached to the coat.
De knoop van zijn jas is los.
The button of his coat is loose.
The word 'los' is used metaphorically to indicate someone's decision to release control or grip over something, symbolized by reins.
Hij laat de teugels los.
He lets the reins loose.
In this sentence, 'los' is used in a figurative manner describing the feeling of detachment or freedom from concerns or stress.