He's 'having a rough time (of it)'. = He's 'going through a rough time'. [=he is having a difficult time; his life has been difficult recently]
The project still has a few 'rough edges'. [=the project still has a few things that need to be changed or finished]
Don't 'be so rough on them' [=don't punish or criticize them so harshly] for making a mistake.
(..) These are from our winter stock, where supply and demand have a big problem. You want to talk about a supply and demand problem? I sell ice for a living. Ooh, that's a rough business to be in right now. I mean, that is really... Ahem. That's unfortunate. Still forty. But I will throw in a (..)2013 Frozen
(..) Put 'em together, It just makes sense! Winter's a good time to stay in and cuddle, But put me in summer and I'll be a... Happy Snowman! When life gets rough I like to hold on to my dream of relaxing in the summer sun just letting off steam! Oh the sky will be Blue... And you guys'll be there too. (..)2013 Frozen
(..) You're my favourite deputy. You've got a friend in me You've got a friend in me Come on, let's wrangle up the cattle. When the road looks rough ahead And you're miles and miles from your nice, warm bed Round 'em up, cowboy! Just remember what your old pal said (..)1995 Toy Story