1 to blush or cause to blush
2 to flow or flood or cause to flow or flood with or as if with water
3 to glow or shine or cause to glow or shine with a rosy colour
4 to send a volume of water quickly through (a pipe, channel, etc.) or into (a toilet) for the purpose of cleansing, emptying, etc.
5 to cause (soluble substances in the soil) to be washed towards the surface, as by the action of underground springs, or (of such substances) to be washed towards the soil surface
6 tr; usually passive to excite or elate
7 a rosy colour, esp. in the cheeks; blush
8 a sudden flow or gush, as of water
9 a feeling of excitement or elation
the flush of success
10 early bloom; freshness
the flush of youth
11 redness of the skin, esp. of the face, as from the effects of a fever, alcohol, etc.
12 (Ecology) an area of boggy land fed by ground water
13 having a ruddy or heightened colour
(C16 (in the sense: to gush forth): perhaps from flush3)