πού (with tonos on υ) means where. It is used only in direct and indirect questions.
Examples:
Πού πας; = Where are you going? (direct question)
Δε μου είπε πού πήγαινε. = He did not tell me where he was going. (indirect question)
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.