Usually means: Register to join or participate.
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We found 21 dictionaries that define the word sign up:

General (15 matching dictionaries)
  1. sign-up, sign up: Merriam-Webster.com
  2. sign-up, sign up: Oxford Learner's Dictionaries
  3. sign up: Collins English Dictionary
  4. sign up: Vocabulary.com
  5. Sign-Up, Sign-up, sign-up: Wordnik
  6. sign up: Cambridge Advanced Learner's Dictionary
  7. sign up: Wiktionary
  8. sign-up: Infoplease Dictionary
  9. sign-up, sign up: Dictionary.com
  10. sign up: Rhymezone
  11. sign up: Free Dictionary
  12. sign up: Mnemonic Dictionary
  13. sign up: Dictionary/thesaurus

Business (1 matching dictionary)
  1. sign up: Legal dictionary

Computing (1 matching dictionary)
  1. sign up: Encyclopedia

Medicine (1 matching dictionary)
  1. sign up: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. sign up: Idioms

Slang (2 matching dictionaries)
  1. sign up: Green’s Dictionary of Slang
  2. sign up: Urban Dictionary

(Note: See sign-up as well.)

Definitions from Wiktionary (sign up)

verb:  (transitive) To add a name to the list of people who are participating in something.
verb:  (intransitive) To add one's own name to the list of people who are participating in something (including amateur, but not professional, teams)
verb:  (intransitive) To agree to purchase some good or service.

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Words similar to sign up

Usage examples for sign up

Idioms related to sign up

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Words that often appear near sign up

Rhymes of sign up

Invented words related to sign up

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