This is the 6391st most frequent Polish word.
byłeś
"Byłeś" means "you were" (masculine singular) in English.
The word 'byłeś' here shows the past tense second-person singular masculine form of the verb 'to be,' indicating an action completed in the past where the subject is male.
Byłeś wczoraj na spotkaniu.
You were at the meeting yesterday.
In this sentence, 'byłeś' is used in the past tense to inquire if a male individual has experienced being in Poland at any point in the past.
Czy byłeś kiedyś w Polsce?
Have you ever been to Poland?
Here, 'byłeś' conveys the past state of being busy, referring to the male subject in the second person singular.