SYDNEY - “Shirtfront”, an aggressive Australian sports term used by Prime Minister Tony Abbott to challenge Russia’s Vladimir Putin, was Wednesday picked as the National Dictionary Centre’s word of the year, beating “man-bun”. Abbott in October vowed to “shirtfront” - an Australian Rules football term in which a player charges an opponent - the Russian president over the crash of Malaysia Airlines MH17 in rebel-held eastern Ukraine. Some 298 people died in the July incident, including 38 Australian citizens and residents, with the West claiming the plane was blown out of the sky with a missile supplied by Russia, an allegation Moscow denies. “I’m going to shirtfront Mr Putin - you bet I am,” Abbott said about what he would do when he met him at the G20 leaders’ summit in Brisbane last month.