Sucking Teeth

I agree with the interpretation of it as making a low tuneless whistling sound by sucking air in between the teeth. My interpretation is that Sam is actually showing a certain amount of impatience here, to go along with his general depression. In this moment I imagine him more than ever as resembling a private soldier/batman/tommy - perhaps standing around on a parade ground or railway platform, waiting for the officers and NCOs to get themselves sorted out and give their orders. By rights he should really be sucking on a damp dog-end.
 
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