Definitions from Wiktionary (block out)

▸ verb:  (transitive) to prevent from entering or penetrating.
▸ verb:  (idiomatic, transitive) to prevent (a thought) from entering one's mind.
▸ verb:  (transitive) to cover something, so as to make it impossible to see.
▸ verb:  (transitive) to begin to reduce to shape; to mark out roughly; to lay out.

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