Droop

Droop: Nothing to do with Breweries! Droop is the amount the shaft is deflected in the toe down direction at impact.

DROOPING - a downward bending of the shaft during the swing which creates
shots off the toe of the club.
ELASTOMER - a polymer which has the elastic properties of rubber. Used
predominantly in the covers of balls or for inserts in putters.

Droop (Shaft Droop)
The movement of a club head, toe down, as caused by the club being swung and the shaft bending perpendicular to the ground line.
Drop ...

In the case of Zac Adams, a longer backswing doesn't just mean cocking the wrists at the top of the swing so the shaft droops down to the ground. A big backswing also means making a big, powerful rotation of the upper body.

The more the green tilts, the more the spider's legs droop in a more pronounced curl. The faster the green speed, the more elongated the spider as a whole, including the head and legs. The longer the putt, the bigger the spider.

See also: Form, Tee, Single, Golf, Wood