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to assume an indifferent air―put on an unconcerned air―put a good face on the matter―carry it off well
to push for the purpose of making something turn
ほぞをかむ(ほぞをかんで悔やむ)
へそをかむ
ほぞを喰んで悔む
to stand upon one's honour―emulate one in love (or generosity)
安直にすむ