"easy victory," 1838, such as one that happens in the absence of competitors, when the solitary starter can traverse the course at a walk. Transferred sense of "anything accomplished with great ease" is attested from 1902. To walk (all) over (someone) "treat with contempt" is from 1851.
With him out of the way it would be a walk-over for the Sox.
The expression is used advisedly, for it was nothing but a "walk-over."
The Two Cock had been won in a walk-over, and the Thirds by two points.
And no money shall be awarded to a boat for a walk-over, but she may fly a flag therefor.
It looks like a walk-over unless The Spectator has something up its sleeve.
As he sat down, I realized that it was not going to be a walk-over.
At first thought it seemed that Goliath would have a “walk-over.”
It revived the recent vast laugh and concentrated it upon Pinkerton; and Harkness's election was a walk-over.
Of course we've got the age on him—those hides are a strong card—but we're not going to have a walk-over.
At the moment when his mother entered a straw might have turned his resolution in favour of giving the lead a walk-over.