Plump definition

(1) Euphemisms for slightly fat

"A generation ago...buxom actresses were popular"- Robt.A.Hamilton

"Chubby babies"

"Pleasingly plump"

(2) Straight down especially heavily or abruptly

"The anchor fell plump into the sea"

"We dropped the rock plump into the water"

(3) The sound of a sudden heavy fall

(4) Make fat or plump

"We will plump out that poor starving child"

(5) Set (something or oneself) down with or as if with a noise

"He planked the money on the table"

"He planked himself into the sofa"

(6) Drop sharply

"The stock market plummeted"