geswerian

Meaning

1. to swear an oath, promise

   On þām ġewinne, ⁊ on moneġum oþrum æfter þǣm, Hannibal ġecȳþde þone nīþ ⁊ þone hete þe hē beforan his fæder ġeswōr, þā hē nigonwintre cniht wæs, þæt hē næfre ne wurde Rōmana frēond.

   In that battle, and in many others after that, Hannibal proved the hatred and hostility that he swore before his father when he was a nine-year-old boy, that he would never become a friend of the Romans.

   late 9th century, translation of Orosius’ History Against the Pagans

2. to confirm by oath

Conjugation