n steps consisting of two parallel members connected by rungs; for climbing up or down
n ascending stages by which somebody or something can progress
n a row of unravelled stitches
v come unraveled or undone as if by snagging
n. 梯子( ladder的名词复数 ); 阶梯; 途径; （紧身裤袜或长筒袜的）滑丝