blackmail (noun) - the act of putting pressure on a person or a group to do something they do not want to do, for example by making threats or by making them feel guilty - การขู่ว่าจะเปิดโปงความลับ, หักหลัง, ขู่, ขู่กรรโชก

blackmail (verb) - to force somebody to give you money or do something for you by threatening them, for example by saying you will tell people a secret about them - ขู่เข็ญเอาเงิน