This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 欯 is uncertain. It visually combines 吉 and 欠, but the original semantic and phonetic roles are unclear.
The left side 吉 suggests good fortune, and the right side 欠 suggests lack or yawn. Without a clear meaning, picture a lucky yawn that leaves you feeling refreshed but uncertain.
For キツ, imagine a lucky kitsune (キツネ, fox) yawning beside the kanji: kitsu -> キツ.