Merriam-Webster's Collegiate® Dictionary, 11th Edition
PLUMP
I. verb
Etymology: Middle English
Date: 14th century
intransitive verb to drop, sink, or come in contact suddenly or heavily , to favor or decide in favor of someone or something strongly or emphatically, transitive verb to drop, cast, or place suddenly or heavily, to give support and favorable publicity to,
II. noun
Date: 15th century
a sudden plunge, fall, or blow,
III. adverb
Date: 1594
with a sudden or heavy drop,
2. straight down, straight ahead, without qualification ; directly ,
IV. noun
Etymology: Middle English plumpe
Date: 15th century
group , flock ,
V. verb
Etymology: 6plump
Date: 1533
transitive verb to make plump, intransitive verb to become plump, V
I. adjective
Etymology: Middle English, dull, blunt, from Middle Dutch plomp
Date: 1569
having a full rounded usually pleasing form , ample , abundant , plumpish adjective