American English

Definition of sign up to phrasal verb from the Oxford Advanced American Dictionary

 

sign up to

 phrasal verb
phrasal verb
 
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Phrasal Verbs

sign up to something

 
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to commit yourself to a project or course of action, especially one that you have agreed to with a group of other people, countries, or organizations, in which each person, country etc. agrees to do particular actions as their part of the deal How many countries have signed up to the Kyoto protocol on climate change? sign up to do something We have about 100 people signed up to help so far.
See the Oxford Advanced Learner's Dictionary entry: sign up to