hold your breath
US /hoʊld jʊər brɛθ/
UK /hoʊld jʊər brɛθ/

1.
息を止める, 息をのむ
to stop breathing for a short period of time, often due to anticipation, fear, or to stay underwater
:
•
He had to hold his breath as he swam under the fallen tree.
彼は倒れた木の下を泳ぐ間、息を止めなければならなかった。
•
The crowd seemed to hold its breath as the gymnast performed her final move.
体操選手が最後の演技をする間、観衆は息をのんだようだった。
2.
期待しない, 当てにしない
used to tell someone not to expect something to happen, especially when it is unlikely
:
•
Don't hold your breath waiting for an apology from him; it's not going to happen.
彼からの謝罪を期待して息を止めるな。そんなことは起こらないだろう。
•
They said they'd fix the issue, but I wouldn't hold my breath.
彼らは問題を解決すると言ったが、私は期待しないだろう。