spring on

US /sprɪŋ ɑːn/
UK /sprɪŋ ɑːn/
"spring on" picture
1.

突然提出, 突然告知

to suddenly present something to someone, especially in a surprising or unexpected way

:
Don't spring that question on me now; I need time to think.
別現在突然把這個問題拋給我;我需要時間思考。
They decided to spring the news on him at the party.
他們決定在派對上突然告訴他這個消息。