√styA 'stiffen'
present: [4.] styAyate etc. [perfect: tastyO styAyAt styeyAt astyAsIt styAsyati styAtA ]verbal: styAna stIta stIma -sty/Aya derivatives: st/iyA -styAya C. -styAyana C. stIm/a AV. -stImin AV.B. The last two derivatives perhaps rather from √stim/stIm (or this from them).