(idiomatic, sports) To score one's first points

A mark, such as a line of seaweed, showing the lowest level reached by a body of water. / (by extension) The nadir or lowest point of something.

plural of low-water mark

(Internet slang, sometimes derogatory) Synonym of blue check.

plural of blue check mark

(rare) Alternative form of mark my words

Alternative form of God save the mark

(somewhat archaic) Ironic expression of distaste.

plural of St. Mark's fly

The fly Bibio marci.