I. bleach 1 /bliːtʃ/ BrE AmE noun [uncountable]
a chemical used to make things pale or white, or to kill ↑ germ s
II. bleach 2 BrE AmE verb [transitive]
[ Language: Old English ; Origin: blæcan ]
to make something pale or white, especially by using chemicals or the sun:
She bleached her hair blonde.
The wood had been bleached by the sun.