This is the 1298th most frequent Russian word.
руку
The word "руку" is the accusative singular form of "рука," which means "hand" or "arm" in English.
In this sentence, 'руку' is used in the accusative case as the direct object of the verb 'подняла' (raised). It refers to the singular form of hand.
Она подняла руку, чтобы привлечь внимание.
She raised her hand to attract attention.
Here, 'руку' appears in the accusative case, governed by the verb 'возьми' (take) and describes the action of holding a hand for safety.
Ты возьми руку моего сына, когда будете переходить улицу.
Take my son's hand when you cross the street.
In this construction, 'руку' is again in the accusative case, functioning as the direct object of the preposition 'к' (towards), highlighting a sensory experience.