Hi, 1. Normally, the animal springs the trap, eg by stepping on it. The trapper might spring the trap, eg by sticking a stick into it if he wants to test it, or by pulling a string when the animal enters the trap.
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MichalSOxford Advanced Learner's Dictionary 7th ed. :This isn't incorrect. It is, in fact, very close to what actually happens in the wild while trapping animals. If a desired prey gets into the trap, you wouldn't want it to close slowly. So
spring a 'trap
1 to make a trap for catching animals close suddenly