go into
go into {v.}
1a. To go or fit inside of; able to be put in.
The table is too big to go into the closet.
1b. To be able to be divided into; be divisible into.
Two goes into four two times.
2. To enter a state or condition of; pass into.
John went into a fit of temper when he didn't get his own way.
The sick man went into a coma.
The country went into mourning when the king died.
3. To be busy in or take part in; enter as a job or profession.
The mayor went into politics as a very young man.
Mr, Johnson is going into business for himself.
Bill wants to go into law when he gets out of school.
4. To start to talk about; bring up the subject of; examine.
We'll talk about the dead mouse after dinner, Billy. Let's not go into it now.
The teacher went into the subject of newspapers today.
Compare: LOOK INTO.
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Source: A Dictionary of American Idioms