Tailing
verb
To follow and observe surreptitiously.
“Tail that car!”
To hold by the end; said of a timber when it rests upon a wall or other support; with in or into
To swing with the stern in a certain direction; said of a vessel at anchor.
“This vessel tails downstream.”
noun
The act of following someone.
The part of a projecting stone or brick inserted in a wall.
Sexual intercourse