need one's eyes checked
To be seeing things (having visual hallucinations).
You saw Santa Claus on the roof? I think you need your eyes checked.
adj
Marked with a check mark.
Having a pattern of checks; checkered.
a checked tie
At that moment a long, scraggy individual in a checked suit poked his head into the bar, looked around portentously, whistled mysteriously to my informant, and jerked his thumb and head in the direction of the door.
Of syllables, having a coda.
Of consonants, glottalized.
Verified or validated in some way.
a computer program using checked arithmetic