[…] Here, […], is a second important mechanism of phylogenetic change: technically it is called ‘borrowing’. - Hockett (1958), a pag.389
A single act of borrowing affects, in the first instance, only the borrowing idiolect. […]; borrowing is presumably the most important mechanism by which an idiolect continues to change during adult life. - Hockett (1958), a pag.403