The Tempest dated 1610
To participate in "fair play" means to conduct yourself in a just manner. It could also refer to a baseball play in which a ball is hit within fair territory.
A barnet is Cockney rhyming slang for somebody's hair - originating from the phrase Barnet Fair.
"Fair to middling" means that (whatever the subject) could be better, could be worse, but falls somewhere in a possibly broad range approaching indifference or mediocrity.
The phrase "Fair is foul, and foul is fair" sets the tone for scene one in Macbeth. This line suggests that things are not what they seem and foreshadows the theme of deception and moral ambiguity that will be prevalent throughout the play.
The phrase "fair traffic" can refer to the concept of just and equitable exchange or trade. In Greek mythology, the Cyclops asks these questions to understand if Odysseus and his men have come as friends or foes, as their intentions will determine the Cyclops' response.
The phrase "Play It Again" means to play something again. For example, if this was in a mobile game, it would mean to re-play the level or do the game again.
"Fair fa" is a Scottish phrase meaning "farewell" or "goodbye." It is used to bid someone a fond farewell or to wish them well.
It means a fair court hearing or trial
It means are you, the people that have been washed up from the sea, safe to be around?
a beautiful day a day at a fair
Actually, "at the fair" is an entire prepositional phrase. At is the preposition and fair is the object (a noun).