What is duress in contract law?

Duress to the person

BARTON V ARMSTRONG

Duress to goods

SKEATE V BEALE

THE SIBEON AND THE SIBOTRE

ASTLEY V REYNOLDS

Economic duress

NORTH OCEAN SHIPPING COMPANY V HYUNDAI CONSTRUCTION

PAU ON V LAU YIU LONG

UNIVERSAL TANKSHIPS V ITWF

ATLAS EXPRESS LIMITED V KAFKO

CTN CASH & CARRY LIMITED V GALLAGHER

DSDN SUBSEA LIMITED V PETROLEUM GEO-SERVICES ASA