Real Dictionary

follow through
phrasal verb: If you follow through an action, plan, or idea or follow through with it, you continue doing or thinking about it until you have done everything possible.

follow through in British English
the act or manner of continuing the swing or stroke of a club, a racket, the arm, etc. to its natural end after striking or releasing the ball, puck, etc.
to carry out fully, as a stroke of a club in golf, a racket in tennis, etc.
to complete (a stroke or shot) by continuing the movement to the end of its arc
to continue and complete a stroke or swing after hitting or releasing the ball or puck
noun: the act of following through
noun: the completion of a motion, as in the stroke of a tennis racket

follow-through
A follow-through is something that completes an action or a planned series of actions.