Hrossreið

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

hrossreið

f. riding another’s horse.

Possible runic inscription in Younger Futhark:ᚼᚱᚢᛋᛋᚱᛁᛁᚦ

Also available in related dictionaries:

This headword also appears in dictionaries of other languages closely related to Old Icelandic.

• Old Norwegian - Johan Fritzner's Dictionary