Meaning & readings

penetrate, clear, pierce, strike home, sit up (all night)

On’yomi テツ
Nanori あき、つ、てっ、とおる

Origin

This character combines a walking radical on the left, which suggests movement or action, with a sound component on the right that hints at the pronunciation テツ. The idea of walking or moving through something naturally connects to the meaning of penetrating or piercing all the way through — like walking straight through an obstacle. The sense of clarity and striking home comes from this same idea of going completely through something without obstruction, making it clear and complete.

徹 15 strokes

Components

  • 彳 radical left
  • 育+攵 sound hint right

A sound hint component points at the character’s pronunciation, not its meaning — don’t read a meaning into it.

Common words

  • 貫徹 かんてつ accomplishment; realization
  • 徹底 てってい thoroughness; completeness
  • 徹夜 てつや staying up all night
  • 冷徹 れいてつ cool-headed; level-headed
  • 徹底的 てっていてき thorough; exhaustive
  • 徹する てっする to penetrate; to sink in

Easily confused with

These look alike but are unrelated in meaning — check the stroke that differs.

Reference

Strokes
15
Kangxi radical
60
Formation type
Phono-semantic (meaning + sound hint)
Grade
Jōyō (secondary school)
Frequency rank
#968 (newspapers)
Former JLPT
level 1
Unicode
U+05FB9