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flatten (v.)
[flatten 词源字典]
late 14c., "to prostrate oneself," also "to fall flat," from
flat
(adj.) +
-en
(1). Transitive meaning "to make flat" is 1620s. Related:
Flattened
;
flattening
.
[flatten etymology, flatten origin, 英语词源]
[flatten 词源字典]