This is the 2502nd most frequent Catalan word.
vas
"Vas" in Catalan means "glass" or "drinking glass."
In this sentence, 'vas' is the second person singular present form of the verb 'anar', meaning 'to go'.
Vas al mercat cada dissabte.
You go to the market every Saturday.
Here, 'vas' is a noun meaning 'glass' (a container for beverages).
El vas estava ple d'aigua freda.
The glass was full of cold water.
In this usage, 'vas' is part of the reflexive past tense construction for the verb 'quedar-se' (to stay), acting as a reflexive pronoun for the second person singular.