spring on
US /sprɪŋ ɑːn/
UK /sprɪŋ ɑːn/

1.
soltarle algo a alguien, sorprender con
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.
No me sueltes esa pregunta ahora; necesito tiempo para pensar.
•
They decided to spring the news on him at the party.
Decidieron soltarle la noticia en la fiesta.