便
biàn
plain
informal; suitable; convenient; opportune; to urinate or defecate; equivalent to 就[jiu4]: then; in that case; even if; soon afterwards
person (亻) + change (更) = whatever is easy and natural for a person
更 primarily contributes the sound biàn here; the person radical (亻) anchors the sense of human convenience or bodily ease. The character's meanings — from 'convenient' to 'relieve oneself' — all center on what is easy and natural for a person.
你方便的话，我们便开始吧。
nǐ fāng biàn de huà, wǒ men biàn kāi shǐ ba。
if it is convenient for you, then let's get started.
他一听到消息，便马上出发了。
tā yī tīng dào xiāo xi, biàn mǎ shàng chū fā le。
as soon as he heard the news, he then set off immediately.
Words with 便
便宜行事
biàn yí xíng shì
act at one's discretion
大便
dà biàn
to defecate
方便
fāng biàn
convenient; suitable
便利性
biàn lì xìng
convenience
排便
pái biàn
to defecate
通便
tōng biàn
(of medicine or food) to relieve constipation; to promote bowel movement
通便剂
tōng biàn jì
(pharmacology) a laxative
逢人便讲
féng rén biàn jiǎng
to tell anybody one happens to meet
随便
suí biàn
as one wishes
灵便
líng biàn
quick
顺便
shùn biàn
conveniently
领便当
lǐng biàn dāng
see 領盒飯|领盒饭[ling3 he2 fan4]