Crossword clues for Stiffen 6 letters:TAUTENStiffenSTARCHStiffenTENSEDStiffened, with "up"STARCHDry-cleaning stiffenerTENSESStiffensSTARCHShirt stiffenerFIRMUPStiffenSTARCHFabric stiffenerSTEELSStiffensBALEENCorset stiffenerSTARCHStiffening agentSTARCHCollar stiffenerSTARCHStiffen, in a waySTEELSStiffens upSPINESBook stiffenersTENSEDStiffenedBALEENCorset-stiffening materialSTARCHStiffener.STIFFENBecome rigidSTIFFENBecome less flexibleSTIFFENTighten upSTIFFENEDStarched.STIFFENSMakes more rigidSTIFFENAdd starch toSTIFFENGet starched?STIFFENBrace for a shockSTIFFENExhibit stage frightSTIFFENNecks might do itSTIFFENExhibit fright, in a waySTIFFENAdd starchSTIFFENUse starchSTIFFENTense.STIFFENSSetsSTIFFENReact to an insult, maybeSTIFFENBrace oneselfSTIFFENSBecomes tautSTIFFENJell.STIFFENSBecomes rigidSTAYCorset stiffenerTENSEUPStiffenSTAYCollar stiffenerSTAYSCertain stiffenersULNASArm stiffenersHOOPSkirt stiffenerBUSKSPieces of stiffening material, as whalebone.STAYSStiffeners of a kindSTARCHEDStiffened.BUSKPiece of stiffening material.TARLATANStiffened gauze used in millinery.ULNAArm stiffener, at times