サイ, もよう.す, もよお.す

sponsor, hold (a meeting), give (a dinner)

JLPT1 G7 S13 F536

As per # (squat): → squat (with the *urge*) to defecate → *meeting/gathering/function* (← gathering at which attendees squat) → *sponsor*; *hold* (← sponsor/hold a meeting). Here, has no semantic function, being used simply to create a derivative character conveying meanings that dropped from the original one.

[Full Kanji Etymology List]