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The following is a Ki exercise, not technique. Nage assume a right stance. As your partner delivers tsuki with his left hand, attacking your lead, execute tenkan. You are now facing the same direction. Your partner's arm is extended, left foot forward. Grab your partner's wrist and attempt to pull his arm toward you; your partner should resist. Notice how much effort is required to get your partner to move.
Now keep the same position only this time let your hand rest lightly on your partner's wrist without grabbing tightly. Extend Ki and lead his arm ever so slightly forward before bringing it around along an arc that spirals downward toward your body; your partner should resist. We call the slight forward motion taking up the slack. Again, notice how much force is required to move your partner.
Done correctly, taking up the slack opens his shoulder causing your partner's resistance to melt away as his arm is lead along a relatively complex curve which is much harder to resist than the straight line pull described in the first paragraph.