This is the 365th most frequent Turkish word.
bizi
"Us"
Here, 'bizi' is the object pronoun representing 'us' in the sentence.
Bizi bekliyorlar.
They are waiting for us.
In this sentence, 'bizi' again refers to 'us' and acts as the object of the verb 'love'.
Bizi bu kadar sevdiğini bilmiyordum.
I didn't know that you loved us this much.
'Bizi' in this example is the object of the verb 'take', indicating the group being taken home.