ending "+" prompt in R

ending "+" prompt in R

I'm fairly new to R and I made a type-o while entering some code and now
instead of getting the ">" prompt I get a "+" prompt. I appear to be stuck
in some kind of function that is looking for input, but I can't seem to
get out of it. I figure that there must be a better way to fix this
problem then closing R and rerunning my script but I haven't been able to
find anything on google (likely because I don't know the right search
terms).
Thanks for your help, sorry it's a trivial question
The code I entered was as follows:
fit = lm(x~`y) + fit = lm(x~y) + fit + summary(fit) + + + end + ; + break
+ ) + + + + 

 + 
 + quit() + + quit + break() +
abline(b0hat,b1hat) + return(null) +