A force acting on a body in the direction of its motion.
An endeavor.
The work involved in performing an activity; exertion.
To make an effort.
A contortion of the body in an attempt to escape or to perform a difficult task.
Strife, contention, great effort.
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.