Sentence:  "Well," Judd said, "what's the deal. You in or out?" "I have to decide right now?" "We have a meeting with Bruce tonight and church tomorrow morning. You go with us tonight and you promise to go tomorrow, or you move out this afternoon." "The man's <WSD>drawing a line in the sand</WSD> for you," Lionel said. "Lionel!" Vicki scolded. "I'm just sayin', the line has been drawn. You crossing the line, Ryan? Or are you with us?" 
Meaning of the word marked with <WSD> tags:  To lay down a challenge; to provide a test of commitment (often one which carries a high risk) to a cause.