To lay down a challenge; to provide a test of commitment (often one which carries a high risk) to a cause.
To create a real or artificial boundary or distinction between (two places, people or things).
To indicate the threshold or level above which something will become unacceptable or will provoke a response; to create a boundary and imply or declare that its crossing will provoke a (negative) response.
To cause to fail; to frustrate, to prevent.
Placed or situated across something else; cross, oblique, transverse.
A seat across a boat on which a rower may sit.
An act of thwarting; something which thwarts; a hindrance, an obstacle.
A brace, perpendicular to the keel, that helps maintain the beam (“breadth”) of a marine vessel against external water pressure and that may serve to support the rail.