LONDON -- Michelle Obama shared one with her first dog Bo, Hillary Clinton tweeted one with her daughter Chelsea. Now selfie -- the smartphone self-portrait -- has been declared word of the year for 2013 by Britain's Oxford University Press.

The publisher of the Oxford dictionaries says selfie saw a huge jump in usage in the past year, bursting from the confines of Instagram and Twitter to become mainstream shorthand for any self-taken photograph.

Oxford usually assigns a separate word of the year to the U.S. and to the U.K., but it said selfie captured the imagination on both sides of the Atlantic this year.

The term beat other buzzwords including twerk, the sexually provocative dance move that got a huge boost in usage thanks to an attention-grabbing performance by pop star Miley Cyrus; showrooming, the practice of visiting a shop to look at a product before buying it online at a lower price; and Bitcoin, the digital currency that gained widespread media attention.

Also making the shortlist was binge-watch, a verb that describes watching many episodes of a TV show in rapid succession.

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