We found one dictionary that defines the word checks up:

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1. checks up: Wiktionary

Phrases: checks up on, more... ▸ Words similar to checks up ▸ Usage examples for checks up ▸ Idioms related to checks up ▸ Wikipedia articles (New!) ▸ Words that often appear near checks up ▸ Rhymes of checks up ▸ Invented words related to checks up