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stiffen

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stiffen/ˈstɪfən/verb
stiffensstiffenedstiffening
stiffen
/ˈstɪfən/
verb
stiffensstiffenedstiffening
Learner's definition of STIFFEN  
[no object]  : to stop moving and become completely still especially because of fear, anger, etc.
[no object]  : to become painful to move or use — often + up
: to become more severe or strong or to make (something) more severe or strong
[no object]
[+ object]
[+ object]  : to make (something, such as cloth) difficult to bend or move

— stiffener

/ˈstɪfənɚ/noun,pluralstiffeners[count]
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