ABAIRTÍ
IN ENGLISH—IRISH DICTIONARY
To have a thorough knowledge of a subject, eolas domhain a bheith ar ábhar agat.
To have a perfect knowledge of sth., eolas iomlán a bheith agat ar rud.
To be unacquainted with sth., gan eolas a bheith agat ar rud.
To understand one's business, eolas, fios, do ghnó a bheith agat.