Kanji 凸 convex, beetle brow, uneven Related words でこ でこ is a colloquial abbreviation for でこっぱち (forehead), often used in the same dialect. デコ助 is a more insulting, personified form.
おでこ おでこ is the standard polite word for 'forehead'. デコ助 is a derogatory slang term for a person with a large forehead, not the body part itself.
Written forms デコ 助すけ
Common katakana-kanji mixed spelling; the reading デコすけ is restricted to this form.
でこ 助すけ
Hiragana-kanji mixed spelling with the reading でこすけ .
凸でこ 助すけ
Kanji spelling using 凸 for 'convex'; less common and may be considered ateji-like.
デコスケ
kana-only spelling
All-katakana spelling; usually written in kana.
でこすけ
Etymology From でこ (forehead, dialectal/abbreviated form of でこっぱち ) + 助 (suke, a common suffix in male names or derogatory nicknames). The exact origin is uncertain, but it likely arose as a teasing or insulting nickname in the Kantō region.
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