Onside: in a legal position with respect to the ball and boundaries(adjective)
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Use "onsides" in a sentence
"Alex Tanguay passed to Sakic, who kept his balance to remain onsides at the St. Louis blue line."
"Finally, and most tactically, energy efficiency based carbon offsets may be very powerful in bringing key Senators "onsides" with carbon cap-and-trade regulation."
"Martin, who plays on the return and coverage teams, was the one who so coolly recovered the Packers' surprise onsides kick last week."