ガン, もちあそ.ぶ, もてあそ.ぶ

play, take pleasure in, trifle with, make sport of

JLPT0 G7 S8 F2216

As per # (round) + jewel → toy/*play with* a round gem (compare ) → *enjoy*; *take pleasure in* (compare ). Also, *trifle with* and *make sport of*.

[Full Kanji Etymology List]