What does 逃げっこなしにしよう mean?


So, I was reading a children's story and came across this sentence:

>
> 「いいか、この最後{さいご}のローソクが消{き}えたら、本当{ほんとう}のお化{ば}けが出{で}るかもしれん。だが、どんなお化けが出ようと、お互{たが}いに
> **逃{に}げっこなし** にしよう」

What I'm having trouble understanding and dictionaries haven't been able to
help is decoding the 逃げっこなしにしよう part. What exactly is happening there?

If more context is needed, the full text can be seen here (it's only about one
page long, very short): <http://hukumusume.com/douwa/pc/100monogatari/001.htm>




っこ is a suffix that attaches to verbs (in 連用形). It means の事 or する事. It is most
commonly found in the form of っこない which expresses a strong denial as in
絶対…しない or …するはずがない. This may also be っこなし. It typically indicates multiple
people are involved in the activity. Here it means "there will be no running
away". The next line continues with: 「いいとも。どんなお化けが出るか、この目で、しっかり見てやろう」 (Fine.
I'll [stay] and see what kind of monster appears.)




っこ is a suffix that attaches to verbs (in 連用形). It means の事 or する事. It is most
commonly found in the form of っこない which expresses a strong denial as in
絶対…しない or …するはずがない. This may also be っこなし. It typically indicates multiple
people are involved in the activity. Here it means "there will be no running
away". The next line continues with: 「いいとも。どんなお化けが出るか、この目で、しっかり見てやろう」 (Fine.
I'll [stay] and see what kind of monster appears.)

