Definition of nail-biting adjective from the Oxford Advanced Learner's Dictionary

 

nail-biting

 adjective
adjective
BrE
 
; NAmE
 
[usually before noun] Excitement
 
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making you feel very excited or anxious because you do not know what is going to happen a nail-biting finish It's been a nail-biting couple of weeks waiting for my results. More Like This Descriptive compound adjectives with parts of the body back-breaking, ear-splitting, eye-popping, gut-wrenching, hair-raising, lung-busting, jaw-dropping, mind-boggling, nail-biting, rib-tickling, side-splitting, spine-chilling, stomach-churning, toe-curlingSee worksheet. See related entries: Excitement
See the Oxford Advanced American Dictionary entry: nail-biting