"Mother-in-law"

Translation: Mam yng nghyfraith

[tachwedd]

I got this right, using hyphens in the Welsh (which is a correct alternative) but was marked wrong as there is a typo in the Welsh answer. The first hyphen has been typed as _ (underline).

[ibisc]

Just checked, and it is definitely a hyphen in the database. Probably best just to leave out the hyphen if it continues to cause problems - there is no need to use it in the Welsh here.

[mizinamo]

I think what happened is that it showed you the answer as Mam yng-nghyfraith and to show you the difference between its sentence and yours, it underlined the space.

So it's not an underline, nor a hyphen, but a space -- which was just underlined to point it out.

[tachwedd]

OK, thanks both - I'll give the hyphens a miss in future