(gay slang) Rough or tough men, either gay or straight, who are available as casual sexual partners for other men (for example in exchange for money).

A person who operates an air traffic control system, to expedite the safe flow of aircraft.

traffic in slaves

(idiomatic) To show the way or proceed rapidly. / (idiomatic) To set precedent or do something novel; to break new ground.

A treatise.

(Britain) A contrail.

A contrail; a visible line of condensation flowing from the edge of an airplane wing or similar structure.

A contrail

(cricket) A ball bowled so as to pitch roughly half way down the wicket, ie. half-way between batsman and bowler. (From a slow bowler this is a poor delivery, likely to be hit to the boundary.)

(chiefly US) A group of athletic sports, consisting mainly of various kinds of running, jumping and throwing, that take place on a track and the enclosed field.