To pose a challenge or threat; to attack; to compete aggressively.
To cause.
To make something appear, as on a stage or a place of competition.
To strive, to labour in difficulty, to fight (for or against), to contend.
To strive, or to make efforts, with a twisting, or with contortions of the body.
A contortion of the body in an attempt to escape or to perform a difficult task.
Strife, contention, great effort.