Has Been Plain Sailing?

The expression is mostly used in informal contexts to mean 'smooth and easy progress'. When you say that something was plain sailing, you mean things went off without a hitch; there were no problems or obstructions of any kind along the way. 'Clear sailing' and 'smooth sailing' mean the same thing.

How do you use plain sailing in a sentence?

If you say that a task was not all plain sailing, you mean that it was not very easy. Pregnancy wasn't all plain sailing and once again there were problems. We know it won't be plain sailing because there are no easy games at this level.

Has been smooth sailing?

Filters. (idiomatic, uncountable) Used to describe an activity that is not encountering any problems. It's all been smooth sailing; everything has gone exactly according to plan. We had some problems at the very beginning, but it's been smooth sailing since the second week or so.