whack (someone) on the head

Translations
ударить (кого-то) по голове
He accidentally whacked his brother on the head with a toy.
Он случайно ударил своего брата по голове игрушкой.
Definitions
To strike or hit someone on the head, often in a playful or lighthearted manner, but it can also imply a more aggressive action.
Words
whack

verb
ударить
someone

pronoun
кого-либо
on

preposition
по
the

article or possessive pronoun
определённый
head

noun
голова