stiffen

1. Become stiff or stiffer (synset 200419488)
   "He stiffened when he saw his boss enter the room"
   is a type of: change - undergo a change; become different in essence; losing one's or its original nature
   subtypes: rigidify - become rigid
2. Make stiff or stiffer (synset 200418521)
   "Stiffen the cream by adding gelatine"
   causes: stiffen - become stiff or stiffer
   is a type of: alter, change, modify - cause to change; make different; cause a transformation
   subtypes:

   • starch - stiffen with starch
   • buckram - stiffen with or as with buckram
   • ossify, petrify, rigidify - make rigid and set into a conventional pattern
3. Severely restrict in scope or extent (synset 200419690)
   "tighten the rules"; "stiffen the regulations"
   is a type of: bound, confine, limit, restrict, throttle, trammel - place limits on (extent or amount or access)
   same as: constrain, tighten, tighten up

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