Daprast

As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):

daprast

(að), v. refl. to become faint; dapraðist honum sundit, the swimming became difficult for him.

Possible runic inscription in Younger Futhark:ᛏᛅᛒᚱᛅᛋᛏ