We found one dictionary that defines the word size someone/something up:

General (1 matching dictionary)

1. size someone/something up: Oxford Learner's Dictionaries

▸ Words similar to size someone/something up ▸ Usage examples for size someone/something up ▸ Idioms related to size someone/something up ▸ Wikipedia articles (New!) ▸ Words that often appear near size someone/something up ▸ Rhymes of size someone/something up ▸ Invented words related to size someone/something up