便
ベン, ビン, たよ.り

convenience

JLPT3 G4 S9 F729

The right-hand element was originally an element of uncertain composition, but the Old Chinese pronunciation of 便 suggests that this element conveyed the concept "spread" (compare , a constituent element of ). 便 adds person (→ human agency) → cause to spread → *pass smoothly* → *excrement* (← offal that passes smoothly out of the body) → *easy*/*at ease* (← pass smoothly/easily) → *convenient*; *expedient* (← make something easy). Also, *letter*, *message* and *news* (of/from) (← pass word from one place to another).

[Full Kanji Etymology List]