What does "起" mean in "饮食起居"
You should be aware of the contrasting pairs in this phrase.


飲 (to drink)
食 (to eat [not food])
起 (to rise up, get up > be active)
居 (to rest)




Like in English, when a pair of opposites in a category are stated, it sometimes means all things of that category.


The beautiful and the ugly
All folks, old and young