on the sly
US /ɑn ðə slaɪ/
UK /ɑn ðə slaɪ/

成語
1.
偷偷地, 暗中, 私下裡
doing something secretly or furtively
範例:
•
He was eating cookies on the sly when his mom wasn't looking.
他趁媽媽不注意的時候偷偷地吃餅乾。
•
They were meeting on the sly to plan the surprise party.
他們偷偷地見面,計劃驚喜派對。
在 Lingoland 學習這個單詞
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