囲
イ, かこ.む, かこ.う, かこ.い

surround, besiege, store, paling, enclosure, encircle, preserve, keep

JLPT2 G4 S7 F771

As per 韋# (go around) + 囗 circular enclosure → surrounding/encircling enclosure → *surround/encircle*； *enclose* → *besiege* (← besiege a town or citadel by surrounding it).

[Full Kanji Etymology List]