Readings & Meanings:
contain, include, keep in one's mouth
These pickled vegetables are made with manmade food coloring products.
"Now I understand" he said with a barely-contained giggle.
This food's salt content amount is 10mg.
口, kuchi, mouth, is the radical.
今 is the phonetic. Of course, we know it means "now," but the pictograph is of a cover over some kind of contents, meaning to conceal an object by covering it totally. (The idea of "now" came from the idea of seizing a moment--to catch prey, that is.)
Combined, they show something contained in the mouth, or otherwise contained.