do something with one hand behind your back

with one hand tied behind (one's) back

Easily, nearly without having to try at all. I'm a professional musician, so that song is hardly a challenge—I could play it with one hand tied behind my back!
See also: back, behind, hand, one, tie

do something with one hand (tied) behind your back

do something easily.
See also: back, behind, hand, one, something
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