spring on

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释义
突然向…提出(或宣布等)(中间加sth.)(后加sb.)
To present or disclose something to someone unexpectedly or suddenly:

例句
SHERLOCK: Well, short version ...... Not Dead. Bit mean, springing it on you like that, I know. (Sherlock)
夏洛克：简言之，我没死。我知道，突然这么告诉你有点过分。（神探夏洛克）