Upper hand, incidentally, could’ve come from observing the game of hand wrestling. When one player gains the “upper hand” – when his hand begins to lean over and above the opponent’s hand – he usually wins in an instant. “Gaining an upper hand”, therefore, means taking control of a situation.
Anyways, figuratively speaking, to get a leg up is to gain an advantage.
Here are media examples:
1. Former Vice President Al Gore, seeking to shake up an energy debate that is focused mostly on drilling, challenged the United States to shift its entire electricity sector to carbon-free wind, solar and geothermal power within 10 years, and use that power to fuel a new fleet of electric vehicles.
The goal is the most ambitious energy plan by a major U.S. political figure - and one many energy experts say is unrealistic. Gore insists the only real obstacle is the reluctance of America’s leaders to seek bold solutions to high energy prices and global warming. He likened his challenge to President John F. Kennedy’s 1961 call to put a man on the moon.
...
A centerpiece of Gore'’ plan would be to help beleaguered U.S. automakers produce a new national fleet of plug-in electric vehicles. Foreign competitors, especially Toyota, have taken a lead in selling fuel-efficient hybrids. Gore said U.S. automakers could regain their edge with new electric cars that can be plugged in at night - saving consumers money while reducing air pollution and U.S. dependence on foreign oil.
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