Thanks for the comment. I've checked this and there should be hints appearing. There could be a glitch here somewhere.
This is frustrating for us as well as we have added the hints and they appear to be there from our side. Many apologies for their non-appearance, yet another Duolingo clitch.
The construction of this phrase is:-
'sdim ots' is a contraction of 'does dim ots' which means literally 'there are no odds/difference' in other words 'it doesn't matter'
'wsdi' is a contraction of 'gwyddost ti' = you know (gwyddost ti is a form of the verb 'gwybod' to know' http://clwbmalucachu.co.uk/cmc/cheat/cheat_gwybod.htm
The English to Welsh hints are all there. For the Welsh to English the system seems to have a problem with words that begin with an apostrophe so I've tried a 'work-around' and written whole sentence hints for each of the sentences involving 'sdi.
This should be live within a few hours.
mcode - still not working at of july, 2018 and welsh dictionary is needed as it showed up once in google search but is not really available. thanks!