mark my words

black mark

Something that negatively affects someone's reputation.

easy mark

Someone who is easily fooled or victimized.

empty words

Any type of talk with little meaning; a message that seems to contain meaningful content but is actually vapid.

get off the mark

To score one's first points

have words

To argue, to have an argument.

make one's mark

To make, or leave, a lasting impression, especially to achieve prominent success.

man of few words

A man who doesn't speak much; a habitually terse or taciturn man.

mark one's own homework

To assume the role of evaluating one's doings when a disinterested party is required.