One breath; a single inhalation/exhalation.
深呼吸して一息ついた。
I took a deep breath and relaxed for a moment.
彼は一息でグラスの水を飲み干した。
He drained the glass of water in one gulp (in one breath).
一息で階段を駆け上がるのはきつい。
Running up the stairs in one breath is tough.
A short amount of time; a brief interval.
一息の時間をください。すぐ戻ります。
Give me a moment; I'll be right back.
会議の合間に一息入れよう。
Let's take a short break between meetings.
A break or breather; a short rest or pause.
長時間の作業の後で一息入れた方がいい。
It's better to take a break after working for a long time.
一息ついてから続きを始めよう。
Let's take a breather and then continue.
彼女は一息もつかずに話し続けた。
She kept talking without taking a single break.
Doing something all at once; in one go (used as 〜に).
彼は宿題を一息に片付けた。
He finished his homework in one go.
掃除を一息に終わらせて、午後は休んだ。
I finished cleaning all at once and rested in the afternoon.
A small amount of effort; a little more push or determination.
あと一息だ、がんばって！
One more push—hang in there!
成功まであと一息のところで諦めないで。
Don't give up when you're just one step away from success.