• WordNet 3.6
    • v flump 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"
    • v flump fall heavily
    • ***
Century Dictionary and Cyclopedia
    • flump To throw down with violence.
    • flump To throw one's self down heavily; flop: as, she flumped down into a chair.
    • ***
Chambers's Twentieth Century Dictionary
    • v.t Flump flump (coll.) to throw down violently
    • v.i Flump to throw one's self down heavily
    • n Flump the dull sound so produced
    • ***


In literature:

The book dropped from his hand and fell with a flump on the floor.
"Beyond" by John Galsworthy
Then their four frilled hands came down and they flumped out of the high bed.
"Pointed Roofs" by Dorothy Richardson
She entered Mrs. Gartney's presence with nonchalance, and "flumped" incontinently into the easiest and nearest chair.
"Faith Gartney's Girlhood" by Mrs. A. D. T. Whitney
The conflicting accounts of Miss Flump, Miss Finch, Mrs Mendham, Crump, and Mrs Jehoram had puzzled her immensely.
"The Wonderful Visit" by Herbert George Wells