European Union (Withdrawal) Bill

Just before my noble friend leaves Amendment 53, I will say that I have followed her almost entirely and agreed with her, but I do not understand in practice what the amendment means by requiring UK courts and tribunals to “have regard to” relevant decisions of the European court relating to cases referred to it by the domestic courts of EU member states. In practical terms to a layman, what does “have regard to” mean? Is it standard legal terminology?