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deterrent, balk, check, hindrance, hinderance, impediment, baulk, handicap, obstruction, obstacle | something immaterial that interferes with or delays action or progress | |
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obstacle, hurdle, hindrance, impediment | an obstruction that stands in the way (and must be removed or surmounted or circumvented) | |
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obstacle, obstruction | something immaterial that stands in the way and must be circumvented or surmounted |