In circulation
If something is “in circulation,” it is going or passing from person to person or place to place.
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If something is “in circulation,” it is going or passing from person to person or place to place. Moderna is already developing booster shots that target the Omicron variant that’s currently “in circulation,” or that’s currently passing from person to person. That rumor has been “in circulation” for a long time. Two-dollar bills are no longer “in circulation” in the United States.