stiffen in German
stiffen in German
aufdoppeln
(transitive) To make stiff.
aussteifen
(transitive) To make stiff.
ertüchtigen
(transitive) To make stiff.
versteifen
(transitive) To make stiff.
verstärken
(transitive) To make stiff.
versteifen
(intransitive) To become stiff.