“Chalk and cheese” describes two things that are completely different. Here is the meaning, likely origin, and how to use it well.

Coyote entered English through Spanish, but its deeper source is Nahuatl, the language associated with the Aztecs and still spoken in Mexico.

Tomato entered English through Spanish tomate, but the word goes back to Nahuatl, the language spoken by the Aztecs in Mexico.

“Draw a line in the sand” means setting a firm limit. Here is the likely origin, plus how the phrase is used today.