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Definition of Draw a line in the sand
1. Verb. (intransitive) To lay down a challenge; to provide a test of commitment (often one which carries a high risk) to a cause. ¹
2. Verb. (idiomatic) To create a real or artificial boundary or distinction between (two places, people or things). ¹
3. Verb. (idiomatic) To indicate the threshold or level above which something will become unacceptable or will provoke a response; to create a boundary and imply or declare that its crossing will provoke a (negative) response. ¹
¹ Source: wiktionary.com