trail/ treɪl /

1.noun [c] 
(path) 小路

2.noun [of footprints etc] 


3.vt.[+scarf] [ coat] [ fingers] 
(drag) 拖

4.vt.[+person] [ animal] 
(follow) 跟踪

5.vi.[scarf] [ coat] [ fingers+] 
(drag) 拖曳

6.vi.
(move slowly) 拖着步子走

7.vi.
(in game,contest) 落后

to be on the trail of sb/sth, be on sb's trail
追踪某人/某物