1) (Another form of the word flap.) Souse; plump; flat. Ex. 'His foot slipped, and down he came flop.'--Forby's Vocabulary.
TO FLOP
2) To flap.
Fanny, during the examination, had flopped her hat over her eyes, which were also bathed in tears.--Fielding, Joseph Andrews.
·noun Act of flopping. II. Flop ·vt To turn suddenly, as something broad and flat. III. Flop ·vi T...
Webster's Dictionary of the English Language
a small pasty, or turn-over. Glouc. ...
A glossary of provincial and local words used in England by Francis Grose
To fall flat down: as "soused flop in the lee-scuppers." ...
The Sailor's Word-Book