noun

• (British, historical) A horse-drawn, and then later, motorized omnibus with open sides, and often, no roof.
  "A little further on, to the right, was a large garage, where the charabancs stood, half in and half out of the yard."
• (British, dated) A bus, especially one hired by groups for pleasure outings, what was later called a coach.
  "Oh shit, there goes the charabanc! Looks like I'm gonna be stuck here the whole summer"
• (British, informal) A vehicle that is slow, overcrowded, or otherwise undesirable.
  "We return to the charabanc of a car to find a swarm of children dancing round it, clambering up the back, jumping on the step; the driver sleeps peacefully at the wheel, oblivious of their shrieks."

verb

• (rare, ambitransitive) To travel or convey by charabanc.