From Longman Dictionary of Contemporary Englishspring something on somebody phrasal verbTELLto tell someone something or ask them to do something when they do not expect it and are not ready for it It’s not fair to spring this on her without any warning. → spring→ See Verb table
Examples from the Corpus
spring on • As he prepared for his senior season at Hart, 30 college coaches attended spring practice.• Close by are the famous Dimmuborgir, Grjótagjá and Stóragjá underground hot springs.• The two companies had begun negotiations last spring.• Instead, his cheerleading coach said, he chose to spend his spring break on a cruise ship.• One spring Conran went on a tour of sixty shops which sold his furniture.• But now I feel I should have sprung it on him more or less suddenly.• Storia Two, published last spring, was on Love, while Storia Three is based on a game of literary consequences.• And in other areas strong regional bodies have sprung up on their own, such as the Cape Cod Commission. 