Semantics

Он зашёл в воду по пояс. He went into water up to his waist.
This entry is concerned with the use of the word пояс to refer to the part of the human body between the rib cage and the hips. This word does not refer to animals. For the difference between the word пояс and its synonym талия, see Lexical Relationships: Synonyms. The word пояс is also used to refer to belts, sashes, and other similar items of clothing, a meaning not described in this dictionary.