1. put something on hold until a later date
let's stick a pin in it until the next meeting
If you tell someone to 'put a pin in it' or 'stick a pin in it', it means you're asking them to hold onto that thought or idea to come back to it later. This is a very informal expression used in both social and professional contexts. It is particularly useful in brainstorming situations. Similar in meaning to 'hold that thought' or 'let's get back to that later'.