Sentence:  My class was wearing butter-yellow pique dresses, and Momma <WSD>launched</WSD> out on mine. She smocked the yoke into tiny crisscrossing puckers, then shirred the rest of the bodice. 
Meaning of the word marked with <WSD> tags:  To move with force and swiftness like a sliding from the stocks into the water; to plunge; to begin.