Sentence:  `` - had enough brains to call ya up so as ya could do sompin about it when the parents - I coulda <WSD>let</WSD> her go go '' - His eyes were lowered , so he could n't have seen the narrow , pointed face of his companion suddenly writhe with fury ; but he was aware of it just the same . 
Meaning of the word marked with <WSD> tags:  make it possible through a specific action or lack of action for something to happen