Sentence:  But Tommy was bashful, and the attention he had thus drawn upon himself made him <WSD>blush</WSD>. He was a timid lad and he shrank away now, evidently fearing Shell. 
Meaning of the word marked with <WSD> tags:  To become red in the face (and sometimes experience an associated feeling of warmth), especially due to shyness, shame, excitement, or embarrassment.