Any intricate and complex problem having a simple solution.
The legendary knot tied to a pole near the temple of Zeus in Gordium.
An obstacle, real or perceived, physical or abstract.
An artificial barrier, variously constructed, over which athletes or horses jump in a race.
A movable frame of wattled twigs, osiers, or withes and stakes, or sometimes of iron, used for enclosing land, for folding sheep and cattle, for gates, etc.; also, in fortification, used as revetments, and for other purposes.
To compete in the track and field events of hurdles (e.g. high hurdles).
To overcome an obstacle.
To jump over something while running.
To hedge, cover, make, or enclose with hurdles.