to be not less than (a certain quantity, amount etc)
不 (bù) · 4 strokes
Pictograph of sepals of a flower. The modern meaning "no" is a phonetic loan.
下 (xià) · 3 strokes
Originally a small line or dot below a longer line, indicating "down". The vertical line was added to distinguish the character from 二 (two). Opposite of 上.