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"barrier" is also used as a crossword clue. If that's what you saw, the answer is often blocker (7 letters).
Definitions
a structure or object that impedes free movement
Word origin
From Middle English barrer, barrere, barryȝer, from Anglo-Norman barrere (compare French barrière), from barre (“bar”).
Used in a sentence
“The bus went through a railway barrier and was hit by a train.”
“The bomber had passed through one checkpoint before blowing himself up at a second barrier.”
“Even a small fee can be a barrier for some students.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Something blocking the way”7 letters
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