Learn what "the syringe is just a backup" means, when people say it, and how to use it naturally in English.

It means the speaker is saying the syringe is not the main plan, only a fallback.
From In Her Shadow, Episode 43
The speaker says the syringe is only being kept as a backup option.
Use this when explaining that something is only there in case the main plan fails. In this context it sounds ominous and threatening, not polite.
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