上下
up and down; top and bottom; old and new; length; about
上下五千年
popular history of China in three volumes by Cao Yuzhang 曹余章
上下其手
to raise and lower one's hand (idiom); to signal as conspiratorial hint; fig. conspiring to defraud
上下文菜单
context menu (computing)
上下班
to start and finish work
天上下刀子
lit. knives rain down from the sky (idiom); fig. (even if) the sky crumbles