Running Silent 

In nautical terminology Running Silent (also known as Silent Running) is defined as a standard operating procedure used by the crew on a submarine when they wish to become or remain as undetectable as possible.

Slang Term: The act by a person to either avoid complete detection or to minimize one's presence. To hide or be deceptive or sneaky.

Similar slang expressions are: Going Ghost, Hide and Seek, Under the Radar, Stealth Mode, Duck and Cover, On the Down-Low, etc.

Ever since I asked Damian about the money he owes me he's been running silent and avoiding me at every opportunity.

Running Silent by Who 'Dis? Who 'Dat? April 30, 2019

Running Silent 

Top Battlefield Twitch Streamer, dominates in Firestorm and Conquest

"Bro, you just got killed by Running Silent. Go to his twitch and tell him that he is trash

Running Silent by ITroll4Lolz October 23, 2019

silent running 

A mind game technique when you do not give a candidate positive or negative feedback at any time. It is a type of mind game used in boot camp while training soldiers.

The soldier was not told if he passed or failed the exam and was sent to the next task as part of the silent running mind game.

silent running by THX1138_ March 4, 2015