This is the 18310th most frequent Russian word.
шляпу
"Шляпу" is the accusative form of "шляпа," which means "hat" in English.
The word "шляпу" is used here in the accusative case as the direct object of the verb "надел" (put on).
Я надел шляпу и вышел на улицу.
I put on a hat and went outside.
The word "шляпу" again appears in the accusative case, serving as the direct object of the verb "купила" (bought).
Моя сестра купила новую шляпу.
My sister bought a new hat.
In this sentence, "шляпу" is in the accusative case, used as the direct object of the verb "положил" (placed).