ガン, ふく.む, ふく.める
include, bear in mind, understand, cherish
JLPT2 G7 S7 F466
As per 今# (contain) + 口 mouth → *contain in the mouth*; *contain*; *include*. Extended meanings include *bear (in mind)*, *have*, *hold* and *imply*, as well as *give instructions* and *understand* (← give instructions that the hearer takes in and comprehends).
[Full Kanji Etymology List]