We thought the rider fell off or something and it was going to crash. Then it turned and kept mowing. Park Roomba!
Another picture:
We thought the rider fell off or something and it was going to crash. Then it turned and kept mowing. Park Roomba!
Another picture:
It’s a past participle.
e.g. “The park or meadow having been newly mown, had an air at once ornamented and natural.”
“An 82-year-old great-grandad survived being mown down by a car”