a leap in the dark
US /ə liːp ɪn ðə dɑːrk/
UK /ə liːp ɪn ðə dɑːrk/

1.
盲目的嘗試, 冒險之舉
an act or decision whose consequences are unknown and potentially dangerous, but which is undertaken anyway
:
•
Starting a new business without a clear plan is often a leap in the dark.
沒有明確計劃就開辦新公司常常是一次盲目的嘗試。
•
She decided to move to a new country without a job offer, which was a leap in the dark.
她決定在沒有工作機會的情況下搬到一個新的國家,這是一次盲目的嘗試。