get onto

idiom

1

: to start to do or deal with (something)

"We need someone to send out the invitations." "I'll get onto it right away."

2

: to start to talk about something

How did we get onto this topic?

3

British : to speak to or write to (someone) about a particular problem, job, etc.

I'll get onto the doctor/plumber straightaway and see if he'll come round.