１８０度ひゃくはちじゅうど

ひゃ

く

は

ち

じゅ

う

ど

Common word

Meanings

1

noun

180 degrees

Literal angle or temperature measurement; used as a noun.

この道どう路ろは１８０度どカーブしている。
This road curves at 180 degrees.
オーブンを１８０度どに予よ熱ねつしてください。
Please preheat the oven to 180 degrees.

2

noun which may take the genitive case particle 'no', adverb

complete about-face; radical change; 180-degree turn

Figurative use for a complete reversal in policy, opinion, attitude, or direction. Often used with 転換, 変わる, 変える, etc.

彼かれの意い見けんは１８０度ど変かわった。
His opinion changed completely.
政せい府ふは方ほう針しんを１８０度ど転てん換かんした。
The government made a complete about-face on its policy.

Written forms

１８０度ひゃくはちじゅうど
Standard modern spelling using Arabic numerals; common in news and everyday writing.
百ひゃく八はち十じゅう度ど
Kanji spelling; rarely used in practice, mostly seen in formal or traditional contexts.

Kanji

度degrees, occurrence, time
百hundred
八eight, eight radical (no. 12)
十ten

Similar words

逆ぎゃく
逆 means 'reverse' or 'opposite' in a general sense, while １８０度 specifically emphasizes a complete 180-degree reversal, often in direction or stance.
真ま逆ぎゃく
真逆 is a casual, emphatic way to say 'completely opposite', similar in strength to １８０度 but less formal and not tied to the angle metaphor.

Etymology

Compound of 百八十 (hyaku-hachijū, 'one hundred and eighty') + 度 (do, 'degree'). The figurative sense comes from the idea of turning 180 degrees, i.e., facing the exact opposite direction.