smooth sailing

: having a continuous even surface

: being the representation of a function with a continuous first derivative

: having or being a short even coat of hair — compare rough, wirehaired

: to make smooth

: to free from what is harsh or disagreeable : polish

: soothe

: a smooth part

: the act of smoothing

: a smoothing implement

: the technical skill of managing a ship : navigation

: the method of determining the course to be followed to reach a given point

: the sport of handling or riding in a sailboat