フォールアウトalso: フォルアウトFreq.FrequencyTop 50,000Meanings1nounradioactive falloutRefers specifically to radioactive particles that fall to the ground after a nuclear explosion or accident.核かく実じっ験けんの後あと、広こう範はん囲いにフォールアウトが観かん測そくされた。After the nuclear test, fallout was observed over a wide area.