Learn Croatian: Oni su razbacali odjeću po krevetu. - They scattered clothes across the bed.

The preposition po paired with the locative case describes an action spreading across a surface or area. While na krevetu just means "on the bed," po krevetu gives the feeling of "all over the bed" or "scattered across the bed." The word krevetu is the locative form of the masculine noun krevet.

Why does the word for clothes end in -u (odjeću)?

It is the direct object of the action (it is what they scattered), so it must be in the accusative case. The dictionary form is the feminine noun odjeća, and feminine nouns ending in -a change that ending to -u in the accusative.

What does the raz- prefix in razbacali mean?

In Croatian, the prefix raz- often adds the meaning of spreading something apart or moving things in different directions. Added to a verb related to throwing, it creates the meaning "to scatter" or "to throw around."

Why does the past tense verb end in -i (razbacali)?

The ending -i is used because the subject Oni refers to a group of men or a mixed group of men and women. If the group was made entirely of women, the pronoun would be One and the verb would end in -e (razbacale).