Report in Meaning in English
expression
Definition
To let someone in authority know that you have arrived, usually at work, a meeting, or for duty. It can also mean to contact someone to give an update or follow instructions.
Usage & Nuances
Slightly formal, common in workplaces, military, or law enforcement. Often used as 'report in to someone' (e.g. 'report in to your supervisor'). Can be physical (arriving in person) or by phone/email. Not the same as 'report on' (give information about something).
Example Sentences
Please report in at the reception desk when you arrive.
basic
All employees must report in by 9 AM.
basic
Soldiers are required to report in every morning for roll call.
basic
You need to report in to HR before your first day starts.
natural
The new recruits didn't report in last night, so the supervisor called them.
natural
Just report in when you get back so we know you're safe.
natural