What does 封闭 (fēngbì) mean in English?

Card 767HSK Level 4767/3571
CARD767
PROGRESS21%
封闭
封閉
fēngbì
occlude; close down(Verb)
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Reveal: Click/Space/Enter/↑↓/w/s/j/k•Navigate: ←→/h/l/a/d