1. What is the meaning of "hold" here?
2/ why "in" before like?
“I got a hold of Emily, called her on the way in like you asked”
1. "get (a) hold of X" is a set phrase, literally meaning to grasp X with one's hands. It is also used non-literally in various ways.
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1. "get (a) hold of X" is a set phrase, literally meaning to grasp X with one's hands. It is also used non-literally in various ways. In your case, "got a hold of Emily" means "succeeded in contacting Emily by phone".
2. "on the way in" means "while I was travelling to / entering this place". "in" refers to motion towards or into.