a boundary beyond which one cannot proceed without consequences
a set limit which has to be adhered to strictly by someone
His resolve to either get a paid internship or drop out of school was his line in the sand.
She drew a line in the sand when she asked David to choose between her and his job.
The teacher drew a line in the sand by demanding the students get 50% in the exams or risk resitting the exams next year.
Tired of the athlete’s antics, the coach drew a line in the sand and asked that either the athlete showed up for all the practices or be kicked off the team.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.