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 put mental pressure on; to ply with motives, arguments, persuasion, or importunity.
To press; to push; to drive; to impel; to force onward.
To present in an urgent manner; to insist upon.
To press onward or forward.
To be pressing in argument; to insist; to persist.
To provoke; to exasperate.
To press hard upon; to follow closely.
A strong desire; an itch to do something.