１８０ひゃくはちじゅう度ど

ひゃ

く

は

ち

じゅ

う

ど

Common word

Meanings

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.

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.

Usage patterns

〈事こと〉が180ひゃくはちじゅう度ど変かわるfor something to change completely
彼かれの態たい度どが180度ど変かわった。
His attitude did a complete 180-degree turn.
〈人ひと〉の意い見けんが180ひゃくはちじゅう度ど転てん換かんするfor someone's opinion to completely reverse
彼かの女じょの意い見けんが180度ど転てん換かんした。
Her opinion made a complete 180-degree reversal.
〈事こと〉を180ひゃくはちじゅう度ど変かえるto completely change something
会かい社しゃは方ほう針しんを180度ど変かえた。
The company completely reversed its policy.

Grammar

一人ひとり・二に本ほん・三さん冊さつnumbers and countersN5

Kanji

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

Related words

真ま逆ぎゃく sense 2
真逆 is a casual, emphatic way to say 'completely opposite', while １８０度 uses the angle metaphor to describe a total reversal.
逆ぎゃくN3sense 2
逆 is a general word for 'reverse' or 'opposite', whereas １８０度 specifically emphasizes a complete, dramatic reversal in stance or direction.
正せい反はん対たい sense 2
正反対 means 'exact opposite' in a neutral, descriptive way, while １８０度 frames the change as a sudden, dramatic turnaround.

Written forms

１８０ひゃくはちじゅう度ど
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.

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.