箱はこ師し

noun

train or bus thief

Slang term for a thief who operates on trains or buses, especially targeting passengers' belongings. The word is not widely used in modern standard Japanese and may be encountered in older or niche contexts.

• 昔むかし、箱はこ師しと呼よばれるスリが電でん車しゃでよく活かつ動どうしていたらしい。

  It seems that pickpockets called 箱師 used to be active on trains in the past.