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Tightrope walker
Question
What does "nail biting" mean?
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450 metres above a gorge near the Grand Canyon.

With no safety harness, American acrobat Nik Wallenda walks the tightrope.

Wind made the cable sway during the 22 nail-biting minutes it took him to cross.

But towards the end he felt confident enough to kneel and blow a kiss to fans waiting on the other side.
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