See obstruct in Webster's New World Roget's A-Z Thesaurus II
verb
To interfere with the progress of:
bog (down), encumber, hinder, hold back, impede. Idiom: get in the way of. See help, openTo stop or prevent passage of:
bar, block, dam, impede. Idiom: be (or stand) in the way of. See openTo cut off from sight:
block (out), conceal, hide1, obscure, screen, shroud, shut off (or out). See show
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