scratch (someone's) head

Translations
быть в замешательстве
The complex puzzle had everyone scratching their heads.
Сложная головоломка заставила всех быть в замешательстве.
Definitions
To be confused or puzzled about something; to think hard about a problem or situation, often because it is difficult to understand or solve.
Words
scratch

verb
чесать
someone's

article or possessive pronoun
чью-то
head

noun
голову