Crossword clues for Stiffen 6 letters:STARCHStiffening stuffSTARCHLaundry stiffenerSTARCHStiffener.STARCHStiffenTENSEDStiffened, with "up"STARCHDry-cleaning stiffenerSPINESBook stiffenersTAUTENStiffenBALEENCorset-stiffening materialSTARCHFabric stiffenerSTEELSStiffensSTARCHStiffening agentBALEENCorset stiffenerSTARCHCollar stiffenerSTEELSStiffens upTENSESStiffensTENSEDStiffenedSTARCHShirt stiffenerSTARCHStiffen, in a wayFIRMUPStiffenSTIFFENBecome rigidSTIFFENBecome less flexibleSTIFFENTighten upSTIFFENSBecomes rigidSTIFFENSMakes more rigidSTIFFENAdd starch toSTIFFENGet starched?STIFFENNecks might do itSTIFFENExhibit stage frightSTIFFENBrace for a shockSTIFFENSBecomes tautSTIFFENJell.STIFFENAdd starchSTIFFENReact to an insult, maybeSTIFFENBrace oneselfSTIFFENUse starchSTIFFENTense.STIFFENEDStarched.STIFFENSSetsSTIFFENExhibit fright, in a waySTAYCorset stiffenerTENSEUPStiffenSTAYCollar stiffenerSTAYSCertain stiffenersULNASArm stiffenersHOOPSkirt stiffenerSTAYSStiffeners of a kindSTARCHEDStiffened.BUSKPiece of stiffening material.TARLATANStiffened gauze used in millinery.