black
verb
blacked; blacking; blacks
: to become black (see black entry 1) : blacken
As she leaned against the stone cross … , the sky blacked with clouds.—
Hugh Coleman Davidson
1
: to make black
blacked his boots
2
chiefly British
: to declare (something, such as a business or industry) subject to boycott by trade-union members
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Merriam-Webster unabridged



