流す， ながす
1. to drain, to pour, to run, to let flow, to flush, to shed (blood, tears), to spill
2. to float (e.g. logs down a river), to set adrift
3. to wash away, to carry away, to sweep away
4. to broadcast, to play (e.g. music over a loudspeaker), to send ...
排出、倾倒、流淌、让……流下、冲洗、流出(血液、泪水)、溢出；冲走；使……漂浮，使……随波逐流；进行广播、播放(例如通过扬声器播放音乐)、发送(通过电线传输电能)
「あっそ」と流すのもよし、本気にするのもよし。
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You can let it slide with a "oh?" or you can take it seriously.
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もちろん冗談と思って彼は「あっそ」と流していましたけどかなり嫌だったそうです。ってゆうか冗談でもそんなこと言うな！
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Of course he thought it was a joke and let it slide with a "hm?" but he was seriously annoyed. I mean, just don't say things like that even as a joke!
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浮き名を流したものだ。
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His romance was the talk of the town.
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彼女は彼の死にそら涙を流した。
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She shed crocodile tears over his death.
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彼女は情に流されやすい。
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She is easily moved to emotion.
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彼は夕方のニュースで、その殺人の裁判を最初に流すことに決めた。
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He decided to put the murder trial first in the evening news.
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電線は電気を流す。
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Wires carry electricity.
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津波で流されてしまったのです。
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It is carried away by tidal waves.
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勢いに流されているんですよ。
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You are carried along with the slide.
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水に流す。
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Don't cry over spilled milk.
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