Nail biter

From Fresh Dictionary

English

Noun

nail biter

1. one who bites or chews his or her fingernails
2. ((idiomatic{{#if:|, {{{2}}}{{#if:|, {{{3}}}{{#if:|, {{{4}}}{{#if:|, {{{5}}}{{#if:|, {{{6}}}{{#if:|, {{{7}}}{{#if:|, {{{8}}}{{#if:|, {{{9}}}}}}}}}}}}}}}}}}})) a nervous or uncomfortable situation

   It was a real nail biter waiting for the test results.

3. An engaging or exciting cliff-hanger.