In French it's just a dead end.

https://en.wikipedia.org/wiki/Dead_end_street
. In the United States and other countries, cul-de-sac is often not an exact synonym for dead end and refers to dead ends with a circular end.

Collin's knows...
https://www.collinsdictionary.com/dictionary/english/cul-de-sac
REGIONAL NOTE:  
in AM, usually use dead end

Maybe drop "cul-de-sac"? I can't speak to British speakers' attachment to it...  I've moved it to the end of the list, at least.

There are some cases where it would be nice if we could identify dialect-specific glosses, especially where a gloss is likely to be misunderstood in other dialects.  I thought "cul-de-sac" was a mistake, but apparently it's BrE. (Or, perhaps, non-American English).

I've never seen anything I would call a "cul-de-sac" in Japan (big round circle of pavement, maybe with an island in the middle, surrounded by houses with lawns, where you can easily turn around a vehicle).  Precisely the kind of thing that comes back from a google image search.  That makes this a silly gloss if your audience includes Americans.  Apparently in BrE it's just a synonym for dead-end.

@@ -27 +26,0 @@
-<gloss>cul-de-sac</gloss>
@@ -29,0 +29 @@
+<gloss>cul-de-sac</gloss>

Not sure there are really two senses.

daij gg5

I nearly put "no through road" in its own sense, for 
clarity.

@@ -27 +27,10 @@
-<gloss>no passage</gloss>
+<gloss>cul-de-sac</gloss>
+<gloss>blind alley</gloss>
+<gloss>no through road (i.e. on signage)</gloss>
+</sense>
+<sense>
+<pos>&n;</pos>
+<gloss>end</gloss>
+<gloss>end of the road</gloss>
+<gloss>end point</gloss>
+<gloss>as far as one can go</gloss>