under your nose
US /ˈʌndər jʊər noʊz/
UK /ˈʌndər jʊər noʊz/

1.
眼皮底下, 近在眼前
in plain sight; in an obvious place, but often unnoticed
:
•
The keys were right under your nose the whole time.
鑰匙一直就在你眼皮底下。
•
He didn't realize the answer was right under his nose.
他沒有意識到答案就在他眼皮底下。