spring a trap

spring a/the trap

To initiate, instigate, or execute a plan to secretly or deceptively take advantage of someone or something. The undercover agent waited until money had been exchanged before springing the trap.
See also: spring, trap
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

spring a ˈtrap

1 make a trap for catching animals close suddenly
2 try to trick somebody into doing or saying something; succeed in this: The burglars were arrested after the police sprung a trap on them last night.
See also: spring, trap
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
investors who were investing in foreign (rather than domestic) investment funds, the PFIC regime can spring a trap on a different group of unsuspecting investors: foreign nationals.