To swallow one's tears; to choke back one’s tears — to suppress grief, disappointment, or mortification without showing it.
試合で負けたが、彼は涙をのんでチームメイトを励ました。
He lost the match but swallowed his tears and encouraged his teammates.
親の前ではいつも涙をのんで明るく振る舞う。
He always swallows his tears and acts cheerful in front of his parents.
不合格通知を受け取っても、彼女は涙をのんで笑顔を作った。
Even after receiving the rejection notice, she swallowed her tears and put on a smile.