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stiffen (v.)
[stiffen 词源字典]
early 15c., "make steadfast," from
stiff
(adj.) +
-en
(1). Intransitive sense from 1690s. Earlier verb was simply
stiff
"gain strength, become strong" (late 14c.). Related:
Stiffened
;
stiffener
;
stiffening
. Compare German
steifen
"to stiffen."
[stiffen etymology, stiffen origin, 英语词源]