This is the 32nd most frequent Dutch word.
gaat
"Gaat" means "goes" or "is going."
In this sentence, 'gaat' is the third person singular conjugation of the verb 'gaan' and indicates movement or the act of going.
Hij gaat naar de winkel.
He is going to the store.
Here, 'gaat' as the third person singular conjugation of 'gaan', is used in an idiomatic expression 'het gaat goed', meaning 'it is going well' to describe someone's state or condition.
Het gaat goed met mij.
I am doing well.
In this exclamation, 'gaat' describes the action of the bus leaving, emphasizing loss or missed opportunity.