godan verb (-su)
soak; saturate; suckle; make hold in mouth; include; instruct; make understand
Broad transitive verb: to cause something to be contained, absorbed, or understood. Covers physical soaking, suckling, including elements, and imparting knowledge. Often used in causative or instructive contexts.
スポンジに水を含ませてから拭いてください。
Soak the sponge with water before wiping.
母親は赤ん坊に乳を含ませた。
The mother suckled her baby.
彼は弟子に技術の神髄を含ませた。
He imparted the essence of the technique to his apprentice.