If you tug something or tug at it, you give it a quick and usually strong pull.
例句
A little boy came running up and tugged at his sleeve excitedly...一個(gè)小男孩跑上來(lái)，非常激動(dòng)地拽著他的袖子。She kicked him, tugging his thick hair.她一邊踢他，一邊扯著他那濃密的頭發(fā)。
N-COUNT
拖船;拖輪
A tug or a tug boat is a small powerful boat which pulls large ships, usually when they come into a port.