Webster's Revised Unabridged Dictionary · 1913

four-in-hand

four-in-hand , noun

1.
A long necktie that is tied in a slipknot with one end hanging in front of the other.
2.
a coach pulled by four horses with one driver.

Four-in-hand , adjective

Consisting of four horses controlled by one person; as, a four-in-hand team; drawn by four horses driven by one person; as, a four-in-hand coach.
A team of four horses driven by one person; also, a vehicle drawn by such a team.
As quaint a four-in-hand As you shall see. — Tennyson