Английский словарь американских идиом - cool down

or cool off {v.} To lose or cause to lose the heat of any deep feeling (as love, enthusiasm, or anger); make or become calm, cooled or indifferent; lose interest. * /A heated argument can be settled better if both sides cool down first./ * /John was deeply in love with Sally before he left for college, but he cooled off before he got back./ * /Their friendship cooled off when Jack gave up football./ * /The neighbor's complaint about the noise cooled the argument down./