Sentence:  The '42 Cardinals are best known for their amazing <WSD>stretch</WSD> run. St. Louis won 43 of their last 51 games and came back from a double-digit deficit in games in early August to edge out the Dodgers for the N.L. flag. 
Meaning of the word marked with <WSD> tags:  The period of the season between the trade deadline and the beginning of the playoffs.