What is Per Minas?

Legal Definition
Per minas, in British common law, to engage in behavior "by means of menaces or threats".

The term comes from Latin.

Per minas has been used as a defense of duress to certain crimes, as affecting the element of mens rea. William Blackstone, the often-cited judge and legal scholar, addressed the use of "duress per minas" under the category of self-defense as a means of securing the "right of personal security", that is, the right of self-defense.

The classic case involves a person who is blackmailed into robbing a bank.

In contract law, Blackstone used per minas to describe the defense of duress, as affecting the element of contract intent, mutual assent, or meeting of the minds.
-- Wikipedia
Legal Definition
By threats. When a man is compelled to enter into a contract by threats or menaces, either for. fear of loss of life, or mayhem, he may avoid it afterwards. 1 Bl. Com. 131; Bac. Ab. Duress; Id. Murder A. See Duress.
-- Bouviers Law Dictionary
Legal Definition
Lat By. threats. See Duress.
-- Black's Law Dictionary
Legal Definition
By threats.
-- Ballentine's Law Dictionary