Definition of "stumbling" []

• Present participle of stumble. (verb)
• The motion of one who stumbles. (noun)

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• "In all, the German sculptor this week placed 10 such memorial cubes, which he calls stumbling blocks (Stolpersteine) in German, into the Prague streetscape, his first batch in the Czech Republic."
• "But I think the main stumbling block is a jurisdictional dispute that has existed for years in the Senate about which committee should have jurisdiction over this legislation."
• "Having worked through Apollo, Skylab, Apollo-Soyuz, Shuttle, and ISS, I think bureaucracy is the main stumbling block for progress."