Ibn Abdul Barr (Rahimahullah) said:

Taqleed (i.e. blind following) is to take the opinion of a scholar without knowing the reason for which he said it or its meaning, and you refuse to take another opinion. Or his mistake becomes apparent to you but you still follow it due to fear of opposing him, even though you know his statement is incorrect. And this is prohibited (i.e. Haram) in Allah’s religion.” ( Jami‟at Bayan ul Ilm wa Fadhlihi Vol. 2 Pg. 787).