Definition of sign up
English to English verb - engage by written agreement
They signed two new pitchers for the next season.
source: WordNet 3.0 - join a club, an activity, etc. with the intention to join or participate,
Sign up for yoga classes.
source: WordNet 3.0
Visual Synonyms 
Nearby Word
sign up, shine up, snap up, sinop, ski jump, sunup, sign off, skin pop, sinumpâ, semi pupa, sannup, sum up, snp, sinopia, sciniph, snap, sump, snub, snip, snow pea
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