they stiffen
-raidissent
Present they conjugation of stiffen.

stiffen

I've got to get this before they stiffen up too much.
Faut le faire avant qu'ils ne soient trop raides.
Beat the egg whites until they stiffen.
Battez les blancs d'œufs jusqu'à ce qu'ils deviennent fermes.
I know your students respect you. They stiffen when you give that disapproving look.
Je sais que tes élèves te respectent. Ils se raidissent quand tu leur lances ce regard désapprobateur.
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