Used figuratively to mean ‘to collapse or flatten into a broad, thin shape; to land heavily in a flat position.’
Definitions
To collapse, flatten, or land heavily in a broad, flat shape. The roof pancaked under the weight of the snow.
In aviation, to make a flat, hard landing with little or no flare. The pilot pancaked the old biplane onto the grass strip.
Synonyms
press flat
flatten down
flatten out