takes genitive case の, noun

Honorific or respectful language.
  1. forbidden, prohibited, banned, taboo.

Variations

Pronunciation Kanji Kana Is Common
 
ご法度 ごはっと
御法度 ごはっと

Contained Kanji Breakdown

method, law, rule
ホウ ハッ ほ (4th, N3)
water, water radical (no. 85)
さんずい
gone, past, quit
さ.る コ キョ (3rd, N4)
soil, earth, ground
ド つち は (1st, N5)
I, myself, katakana mu radical (no. 28)
シ ボウ ム (Kentei 1)
degrees, occurrence, time
ド タク たび (3rd, N4)
dotted cliff radical (no. 53)
ゲン (Kentei 1)
wild goose, trailing cliff radical (no. 27)
カン かりがね (Kentei 1)
twenty
にじゅう ジュウ ニュウ (Kentei Pre-1)
or again, furthermore, on the other hand
また ユウ やす (8th, N1)