What is the meaning of Checked?

Having a pattern of checks; checkered.

Of syllables, having a coda.

Of consonants, glottalized.

Verified or validated in some way.

Delivered to the airline (or train line, ferry, etc.) during check-in to be stored in an inaccessible area to the passenger (the hold) during the flight (or other journey).

simple past and past participle of check

Source: wiktionary.org