Sentence:  Serene, smiling, enigmatic, she faced him with no fear whatever showing in her dark eyes....She put back a truant curl from her forehead where it had sought egress to the world, and looked him full in the face now, drawing a deep <WSD>breath</WSD> which caused the round of her bosom to lift the lace at her throat. 
Meaning of the word marked with <WSD> tags:  A single act of breathing in or out.