slug

名词 slug:

1. a projectile that is fired from a gun
   同义词：bullet
2. an idle slothful person
   同义词：sluggard
3. any of various terrestrial gastropods having an elongated slimy body and no external shell

动词 slug:

1. strike heavily, especially with the fist or a bat
   同义词：slog, swig
2. be idle; exist in a changeless situation
   同义词：idle, laze, stagnate

1. My daughter screamed when she saw a slug.
   我的女儿看见了一条鼻涕虫，尖叫了起来。

slug 4

v.intr.（不及物动词）
slugged,slug.ging,slugs
To wait for or obtain a ride to work by standing at a roadside hoping to be picked up by a driver who needs another passenger to use the HOV lanes of a highway.
等搭便车，等共乘车：希望能搭上便车而站在路边，等待需要另一位乘客以便使用公路专用车道的司机
n.（名词）
A commuter who slugs.
等搭便车的人，等共乘车的人

来源：
Probably from slug 2
Probably from slug 2