A dictionary of Confusable Phrases: More Than 10,000 Idioms and Collocations

go on medication • go on the pill
go on medication —start the treatment of an illness using
drugs: When these children go on medication, parents are
often concerned that daily pill-taking will damage the child’s
self-esteem.
go on the pill —start to take contraceptive pills regularly:
Many women who go on the pill have to try out several dif-
ferent brands before they find the right one.
go on stage • go on the stage
go on stage —(of an actor) appear before the public (also:
come on stage): Andy and Steve Dobinson both went on stage
several times to recite their own poems.
go on the stage —take up the profession of an actor: If he
had gone on the stage he would have made a good actor.
go on stream • go with the stream
go on stream —(also: come on stream) be in active operation:
What is worse, by the time the plants were ready to go on
stream, they were also ready for modernization and refitting.
go with the stream —(also: float with the stream) act or think
as the majority of people do: I am not a yes-man, who agrees
to everything and goes with the stream, but an individual,
having his own opinion.
go in at the deep end
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go on the air • walk on air
go on the air —(also: come on the air) 
1
. (Radio, TV) begin
broadcasting: The radio station went on the air shortly after
the storm. 2. (of a program) be broadcast: Certain programs
go on the air in the form of a mixture of live and recorded
segments. 3. speak over the radio: I suppose you never know
who is listening in when you go on the air.
walk on air —feel very happy or euphoric: I was walking on
air the day I handed the manager the final check to settle our
bill.