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If you have questions about the conjugation of пазуха or Russian nouns in general, you can practice and get feedback from a professional tutor.
У Вас нет холодной котлеты за пазухой?
Tell me, don't you happen to have a cold meat ball stored away on your bosom?
Я протаскал его за пазухой весь день.
I held it in my bosom all day.
Я хочу зарыться с головой у Вас за пазухой.
I want to bury my head in the safety of your bosom.