tar isteach, v.i. 1. (a) Come in, enter. Teacht isteach i dteach, to come into a house. Ná ~ isteach sa rang seo, don’t enter this class. (b) Encroach on. Tá siad ag teacht isteach ar mo chuid talaimh, they are encroaching on my land. 2. Come to pass. Tháinig an tairngreacht isteach, the prophecy was fulfilled. Tiocfaidh mo chuid cainte isteach, my words will come true. Tháinig sé isteach fíor, it proved to be true. Má thagann sé isteach (go), if it comes to pass (that). 3. (With ar)(a) Come to understand, become accustomed to. Teacht isteach ar rud, to get the hang of sth. (b) Get, inherit. Tiocfaidh sí isteach ar an airgead, she will come in for the money. 4. (With adjective) Suit, serve a purpose. Tiocfaidh sé isteach úsáideach, it will come in useful.