タイ, か.える, か.え, か.わる, かえ

exchange, spare, substitute, per-

JLPT2 G7 S12 F979

The relevant seal inscription form is an element# doubling and indicating "stand in alignment" (compare 輦) + say/speech indicator → circular group of people taking turns speaking → *relieve/succeed another*; *replace*; *exchange*; *substitute for* → *alternate*; *change* → *a spare*; *another* (helping of food etc.). Later, was replaced by .

[Full Kanji Etymology List]