a sudden or mysterious disappearance
"The entire team was baffled by their leader's vanishing after he left for lunch without saying goodbye."
a sudden disappearance from sight
"The magician's rabbit vanished instantly when he pulled his hand away, leaving an empty cage behind."
present participle of vanish
"As I turned away from the dark corner, the mysterious figure was vanishing into thin air."
That vanishes.
"As soon as I turned around to check on my friend, he was completely vanishing into the crowd."