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"block" is also used as a crossword clue. If that's what you saw, the answer is often obstruct (8 letters).
Definitions
prohibit the conversion or use of (assets)
Used in a sentence
“a block of ice; a block of stone”
“She picked up the block and examined it.”
“Anne Boleyn placed her head on the block and awaited her execution.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“City square segment”5 letters
02“Prevent passage”5 letters
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