to be on one's last legs = be very tired or ill. He looks like he's on his last legs.
to cost someone an arm and a leg = cost somebody a lot of money. That car cost him an arm and a leg.
to pull someone's leg = tease somebody, make somebody believe something that is untrue. Of course he doesn't want his present back, he's just pulling your leg!
not have a leg to stand on = have nothing to support one's opinion. You can't say that, you don't have a leg to stand on!
to give someone a leg-up = help somebody towards success. When he joined the company I noticed his talent, so I gave him the leg-up he needed.
to shake a leg = hurry up. Come on, shake a leg! We are late!
with one's tail between one's legs = in a humble or sad manner. After being fired, he left with his tail between his legs.
Exercise
Choose the right answer.
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