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Translation and English learning by Britannica
merriam webster
to stiffen up
para endurecer
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to, stiffen, up.
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stiffen verb

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stiffened, has stiffened, is stiffening, stiffens
endurecerse; fortalecer, reforzar (tela, etc.); hacer más duro (un castigo, etc.); entumecerse (dícese de los musculos)

Example sentences of
stiffen verb

  • •She stiffened when he grabbed her shoulder.
  • •The dogs stiffened in alarm.
  • •The law would stiffen penalties for tax evasion.
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Synonyms of
stiffen verb

harden, strengthen