What it means
A cosy little phrase that says everything's tickety-boo again. You trot it out when a poorly pal's back on their feet, a dodgy motor's purring like a kitten, or the world just feels properly sorted. It's the verbal equivalent of a cuppa and a biscuit after a long slog.
Usage examples
"I was proper rough yesterday but a good kip and I'm right as rain now."
"Don't you worry about the telly, love, the repair bloke had it right as rain in ten minutes."
"After all that drama she just cracked on with a smile, right as rain."