This is the 16419th most frequent Russian word.
розу
"Розу" is the accusative form of "роза," meaning "rose" (flower) in English.
The word 'розу' is in the accusative case, indicating that it is the direct object of the verb 'подарил' (gave).
Я подарил ей красивую розу.
I gave her a beautiful rose.
Here, 'розу' is also in the accusative case, serving as the direct object of the verb 'посадила' (planted).
Она посадила розу в саду.
She planted a rose in the garden.
The word 'розу', despite appearing as if in the accusative case, is incorrectly used instead of 'розой' (instrumental case), which should describe 'the means or manner of action' in this grammatical context.