Plump down and Put down

Plump down verb - Set (something or oneself) down with or as if with a noise.

Put down and plump down are semantically related. In some cases you can use "Put down" instead a verb "Plump down".

Put down verb - To express scornfully one's low opinion of.

Plump down and put down are semantically related. Sometimes you can replace term "Plump down" with "Put down", this phrasal verbs are similar.