To try to come out ahead in a competition for something specific or put oneself in a more favourable position generally.
To try to get one's horse into a better position during a horse race.
To present or set up in opposition; to pose.
To object to.
To place in front of, or over against; to set opposite; to exhibit.
To attempt to stop the progression of; to resist or antagonize by physical means, or by arguments, etc.; to contend against.