of Trill
Source: Webster's dictionaryshe used rolling r's as in Spanish Source: Internet
Increasing the stricture of a typical trill results in a trilled fricative. Source: Internet
Single /r/s are tapped (e.g. akkora 'of that size'), double /r/s are trilled (e.g. akkorra 'by that time'), similar to the Spanish pero and perro. Source: Internet
The trilled 'r' is also used by some Māori, who may also pronounce 't' and 'k' sounds without aspiration, striking other English speakers as similar to 'd' and 'g'. Source: Internet
This phrase has Latin origins: the Latin R was trilled to sound like a growling dog. Source: Internet