It is no typo; It is an existing verb.
is the {} ("continuative form") of the verb , which means _**" to pop", "to burst open"**_, etc.
When corn kernels , it is called "popcorn".
So, the line means:
" _ **The fleeting dream bursts open (and)**_ "
A similar-sounding synonym of is , which you might actually see/hear more often. Both are originally Japanese words as, I hope, you can tell from the sounds.
In case you are more of a fan of big Sino-loanwords, {} would be a synonym as well.