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Related to plain sailing: Plane sailing
Smooth, uninterrupted, and/or easy progress, movement, or development. Now that we've gotten that problem figured out, the project should be plain sailing from here on! We've got about a 13-hour road trip ahead of us, but it looks like plain sailing for most of it.
Easy going; straightforward, unobstructed progress. For example, The first few months were difficult, but I think it's plain sailing from here on. Alluding to navigating waters free of hazards, such as rocks or other obstructions, this term was transferred to other activities in the early 1800s.
plain sailingBRITISH or
COMMON If an activity or task is plain sailing, it is easy to do or achieve. Once I got used to the diet it was plain sailing and I lost six kilos over a four month period. All of a sudden, my life started to improve, which is not to say that it was all smooth sailing from then on. Note: In American English, you can also use the expressions clear sailing and easy sailing. It's not going to be clear sailing. He's bound to come up with some tough opposition. Once I'd done the paperwork, the rest was easy sailing. Note: `Plain sailing' is sailing in good conditions, without any difficulties. However, the expression may have come from `plane sailing', a method of working out the position of a ship and planning its route using calculations based on the earth being flat rather than round. This is a simple and easy method which is fairly accurate over short distances, especially near the equator.