n a crowd especially of ordinary or undistinguished persons or things
n an irregular fold in an otherwise even surface (as in cloth)
v become wrinkled or drawn together
n. （橄榄球）自由密集争球( ruck的名词复数 ); 普通人; 寻常事物; （使）起皱褶
v. （橄榄球）自由密集争球( ruck的第三人称单数 ); 普通人; 寻常事物; （使）起皱褶