〈名〉Conduct; moral character
◆彼は素行が修まっている He is well-conducted―of good moral character.
◆素行が修まらない He is ill-conducted―irregular in conduct―loose in morals―a loose liver―a loose fish―a sad dog.
◆素行を慎む to be prudent(in one's conduct)
◆素行を改める to amend(one's conduct)―mend one's ways―reform(oneself)―turn over a new leaf―do better
◆君は素行を改めないと退校ですよ If you will not do better, you will have to leave school.