She didn't sign up for this!
To sign up for something means to agree to do something or to join an organization, a course etc.
Example sentences:
- Our sergeant made us clean toilets with a toothbrush. I didn't sign up for that. They promised us adventure.
- I signed up for a Russian course at the community college.
Right!
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You can also say "sign up to [a verb phrase]" as in "sign up to serve your country".
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