Read the room 

Verb. read the room (third-person singular simple present reads the room, present participle reading the room, simple past and past participle read the room) (idiomatic) to understand the emotions and thoughts of the people in the room Synonym: read the table

Read the room, James. No one here is interested in talking politics right now.
Read the room Matt .What is everyone doing right now

Read the room by NewsINFreehold July 6, 2019

read the room 

1. To understand the state of a conversation so that your tone and subject matter match said conversation.
2. An exclamation used towards anyone who doesn’t read the room before initiating conversation

1. Tom read the room prior to speaking, knowing that Sarah’s kitten had died yesterday.
2. Tom what the fuck, why would you talk about the ballgame when my cat died yesterday? Read the room for goodness sake!

read the room by SuchAFunnyLife February 18, 2021

Read the Room 

Verb. Base what you say on the conversation. Make educated guesses as to what people mean.

Olivia and Rachel, read the room. We don't want to talk yo you.

Read the Room by 1he2he3he June 3, 2020