This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development is uncertain. The modern form combines 氵 (water) with 乞, but the original semantic and phonetic roles are unclear.
With water 氵 and a shape like 乞 (beg), imagine a dry riverbed begging for water, but its true meaning is uncertain.
For キツ, imagine a kitsune (きつね, fox) begging for water by the river: kitsu -> キツ.
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