A douchey/ middle management way to say "let's come back to that later," or, "hold that thought." Increasingly popular in business speak.

Possibly originally from WWII, referring to putting a pin back in a hand grenade so it won't go off.
Employee: "Will we have health benefits during the furlough?"

Mid-level boss: "Let's just put a pin in that, for now."
by tubalcain July 24, 2009
Another way to tell people to stop fighting/arguing and to focus on what is realy important.
Person 1 and Person 2: arguing and threatening each other
You: ,,Put a pin in it guys, we have more important things to care for right now!''
by D3str0y3r176 December 18, 2018