What does 低喝了一声 mean? 低喝了一声


I could not see how 喝 here means drink, so I tried to look further in my dictionary and it says:


  The same as 嗬, which is an onomatopoeia


Which kind of makes sense since I also found a similar expression: 哼了一声.

However the dictionary seems to give it a tone of surprise, but in that case what does it mean together with 低? Maybe I could translate the sentence as:


  he made a small oh
低喝 here may be a shout but not aloud. 喝 is not only drink, but also shout. 低 here is about the voice