I began to get pretty thoroughly ashamed of him for his childishness; and at last, when he repeated that imploring question still another time, I lost my patience for the moment, and spoke pretty brutally to him. It seemed to shrivel him up and cow him; and he looked so wounded and so humble after that, that I detested myself for having done the cruel and unnecessary thing.
What is the meaning of cow as it is used in the sentence?
