Þwínan

According to the Old English Dictionary:

þwínan

p. þwán, pl. þwinon; pp. þwinen To get less, dwindle, be reduced (of a swelling) :-- Beþe ða fét and smyre, ðonne þwínaþ (-eþ, MS.) hý sóna (the swelling goes down), Lchdm. i. 84, 25. Ðonne þwínaþ ða áswollena sina, ii. 282, 8. Tácn ðæt se swile þwínan ne mæg, ne út yrnan on ðære litre, 162, 3: 212, 9. Cf. dwínan. þwinan