1. phrasal verb
If you report back to someone, you tell them about something that they asked you to find out about.
[V P + to] ⇒ The teams are due to report back to the Prime Minister early next year.
[V P] ⇒ I'll report back the moment I have located him.
[V P + on] ⇒ He would, of course, report back on all deliberations.
[V P that] ⇒ The repairman reported back that the computer had a virus. [Also V n P, V P n]
2. phrasal verb
If you report back to a place, you go back there and say that you are ready to start work or say that you are present.
[V P + to] ⇒ The authorities have ordered all soldiers who have returned from the front line to
report back to barracks.
[V P] ⇒ They were sent home and told to report back in the afternoon. [Also V P + for]
3. phrasal verb → report If you report back a comment or remark, often a critical one, you repeat it to the person it was made about.
[V n P to n] ⇒ We reported this back to Krajicek.
[V n P to n] ⇒ They're scared that their sentiments might be reported back to the government.
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers