This is the 947th most frequent Afrikaans word.
vlieg
"Vlieg" in English means "fly."
Here, "vlieg" is used in its literal sense, referring to the action of flying, which pertains to the bird's motion.
Die voël vlieg hoog in die lug.
The bird flies high in the sky.
In this case, "vlieg" is used metaphorically to describe how time seems to pass quickly, emphasizing the subjective experience of time perception.
Die tyd vlieg wanneer jy pret het.
Time flies when you're having fun.
Here, "vlieg" is part of an idiomatic expression, implying a sudden emotional reaction, illustrating its figurative use in Afrikaans.