Wiktionary
n. An instance of this vb. To ward off by holding the arms out straight
WordNet
n. (American football) the act of warding off a tackler by holding the arm fully extended with the hand against the opponent
Usage examples of "straight-arm".
An assortment of six-inch-high capital letter T's, made from cloth, mounted under glass, along with a corny photo of the seventeen-year-old Cozzano, pigskin tucked under one arm, other arm held out like a jouster's lance to straight-arm an imaginary linebacker from Arcola or Rantoul.
The man leaped the ornamental garden, plunged through the hedges, swung over the hood of a parked lawn-truck, straight-armed the over hanging branches of trees, brushed aside several men who tried to stop him.
When he rose straight-armed again, his biceps bulging, he shifted his angle to catch a more sensitive pressure spot.
Hooker felt the ball hit his stomach as the quarterback handed off, and then felt what he later described as a sledgehammer in the stomach and somehow the intruder was casually trotting toward the goal line with the football tucked under his arm, straight-arming imaginary opponents.
I held him away from me with the hand that was entwined in his, straight-arming him.
Taco's left flashed forward again and Rourke let it come, dodging his head right just before impact, feeling the rush of air as the bloodied knuckles passed his face, then straight-arming Taco with his own left fist, then crossing with his right, then his left, then his right, hammering the brigand back, forcing him to his knees, then feigning a low right, but instead, hammering up with his right knee, catching Taco on the tip of the chin and snapping the head and neck back with an audible crack.