draw a line in the sand

Fig. to create or declare an artificial boundary and imply that crossing it will cause trouble. Todd drew a line in the sand by giving his roommate an ultimatum about his sloppiness—he had to start cleaning up after himself or move out.

draw a line in the sand

also draw the line in the sand

to say that a particular idea or activity will not be supported or accepted The president has drawn a line in the sand, which means that if the foreign troops are not removed, they will be attacked.

Etymology: based on the idea of literally making a mark in sand to show someone they cannot move across it

Common Names:

Name	Pronounced	Usage
Claire	[klɛə]
Stribog	-	Slavic Mythology
Laetitia	-	Late Roman, French
VĚNceslav	-	Czech (Rare)
Thaleia	-	Greek Mythology
Rico (1)	REE-ko	Spanish