simple past tense and past participle of round
"He rounded the corner quickly, then rounded up all the stray cats before dinner."
In plain English: To round something means to make its edges smooth and curved instead of sharp or pointed.
"After finishing his work, he rounded up all the loose papers and put them in the bin."
curving and somewhat round in shape rather than jagged
"low rounded hills"
"rounded shoulders"
Made into a circle or sphere.
"The artist carefully rounded the raw clay until it formed a perfect sphere."
In plain English: Rounded means having smooth, curved edges instead of sharp corners.
"The moon appeared fully rounded in the night sky."