Consider contexts: (1) Say there are two siblings and one unexpectedly excels at what the other one is most interested in being good at. The first might 'down play' the results in order not to hurt the sibling who might 'play down' his/her emotional shock or pain in order not to show it and also to maintain genuine support for a sibling's success. (2) Politically, your guess is as good as anyone's.
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