The state of being difficult, or hard to do.
Physical danger from the environment, especially with risk of drowning
An obstacle that hinders achievement of a goal.
An objection.
An awkward situation or quarrel.
That which cannot be easily understood or believed.
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.