flanker
US /ˈflæŋ.kɚ/
UK /ˈflæŋ.kɚ/
1.
a player positioned on the wing in rugby, typically fast and agile, whose role is to support attacks and defend the wide channels
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The flanker made a crucial tackle to stop the opposing team's advance.
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Both flankers were excellent at disrupting the opposition's rucks.
2.
a military aircraft or ship positioned on the side of a main formation to protect it
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The destroyers acted as flankers for the aircraft carrier.
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Two fighter jets flew as flankers, protecting the bomber.