A horserace in which only a single horse competes(noun)
An uncontested or very easy victory(noun)
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Use "walk-over" in a sentence
"The race went from a walk-over for Allen to a nail-biter as "macaca" became a massive national story."
"We already have the first result of the day, with Illlya Marchenko's shoulder injury giving Gilles Simon a walk-over through to the third round."
"While the building code in most towns won't require a tear-off down to the sheathing unless your roof already has two layers, we at least a thorough sheathing inspection from beneath as well as an assessment of its condition during a walk-over evaluation."