『ハリー・ポッターと賢者の石』本
ハリー達のせいでグリフィンド－ル150点減点です。ロンは双子の兄を引き合いに出し、何度も減点の原因になっててもみんなに好かれてるよとハリーを慰めました。
ハリー：だけど一回で150点も引かれたりはしなかったろう？
They've never lost a hundred and fifty points in one go, though, have they?
*in [at] one go：(略式)一気に・一度にまとめて
(プログレッシブ英和中辞典)
*in/at one go：(chiefly British ) in one attempt : without stopping
(merriam-webster.com)
*in one go：All at one time or in one attempt.
We'll never be able to carry all these boxes out in one go—we'll have to make several trips.
(thefreedictionary.com)
***
辞書の例文から派生勉強
*名詞tripの1つの意味：an occasion on which someone goes to a place and returns from it, or the act of traveling from one place to another
(dictionary.cambridge.org)
往復の行い／旅行
・make several/frequent/regular/many/回数 trips
Some had to carry their goods upstairs, and sometimes they had to make several trips.
(From the Cambridge English Corpus)
階段の往復にも使ってた