Trutta

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

trutta

(að), v. to shout trutt, trutt! or trrrh, as horse-drivers do.

Possible runic inscription in Younger Futhark:ᛏᚱᚢᛏᛏᛅ

Also available in related dictionaries:

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

• Old Norse - Cleasby & Vigfusson Dictionary
• Old Norwegian - Johan Fritzner's Dictionary