Drop Round

[Carelvt]

5 letters: P?U?? Thank you...

[cashier]

Plump?

[Mamyalynne]

Yes

nounarchaic
noun: plump; plural noun: plumps
1.
an abrupt plunge; a heavy fall.
"the wagon came into a deep hole, with such a plump"

So Drop and of course Round as in chubby,

[Carelvt]

Thank you very much!