РАЗРЯДИТЬ АТМОСФЕРУVPsubj: human or abstroften infin with надо, нужно etc or in a чтобы-clause) to alleviate the strain or anxiety in a situation, make people calmer, more relaxed
X разрядил атмосферу - X eased (reduced) the tension (in the air)
X diffused the situationX cooled things off (down)(in limited contexts) things simmered down.

Большой русско-английский фразеологический словарь 

А49 →← А47

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