The Proto-Germanic apophony in this case must have been *ders- *dars-, *durs-, *durs- and due to subsequent phonological changes the following cognate forms developed in Germanic languages: Gothic ga-daursan dars daursum/daursun daursta OHG turran tar turrun torsta
OSax durran dar durrun dorsta OFr thura, dura thur, dur, dor thuron thorste, dorste OE * durran dear(r) durron dorste
Obazjaiti 'in Bedrangnis gerat' and the Germanic group of
OSax. thwingan, OHG dwingan, NHG zwingen, etc., is also reasonable.