Webster
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Webster’s Revised Unabridged Dictionary · 1913

Flatten

Flat′ten (flăt′t'n), v. t. [imp. & p. p. Flattened; p. pr. & vb. n. Flattening.] [From Flat, a.] 1. To reduce to an even surface or one approaching evenness; to make flat; to level; to make plane.

2. To throw down; to bring to the ground; to prostrate; hence, to depress; to deject; to dispirit.

3. To make vapid or insipid; to render stale.

4. (Mus.) To lower the pitch of; to cause to sound less sharp; to let fall from the pitch.

To flatten a sail (Naut.), to set it more nearly fore-and-aft of the vessel. — Flattening oven, in glass making, a heated chamber in which split glass cylinders are flattened for window glass.

Flat′ten, v. i. To become or grow flat, even, depressed, dull, vapid, spiritless, or depressed below pitch.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.