To have a cramp in one's leg; when the leg muscles suddenly contract and become painful.
夜中に足がつって飛び起きた。
I woke up suddenly because my leg cramped during the night.
長時間の運動の後、足がつりやすくなることがある。
After prolonged exercise, your legs may cramp more easily.
ミネラル不足で足がつくことがあるので、水分補給も大切だ。
A mineral deficiency can cause leg cramps, so staying hydrated is important.