noun

Colloquialism.
  1. eating one's lunch box before lunchtime (e.g. of a student).

Variations

Pronunciation Kanji Kana Is Common
早弁 はやべん

Contained Kanji Breakdown

early, fast
はや.い サッ ソウ (1st, N4)
day, sun, Japan
ひ にっ ニチ (1st, N5)
ten
ジュウ ジッ ジュッ (1st, N5)
valve, petal, braid
ベン わきま.える べ (5th, N1)
I, myself, katakana mu radical (no. 28)
シ ボウ ム (Kentei 1)
twenty, twenty or letter H radical (no. 55)
キョウ ク にじゅう (Kentei 1)