off-the-charts adjective 1off the charts prepositional phrase 1forms 2 adjective1 •Exceeding the normal range of measurement.The off-the-charts sea temperatures and Antarctic sea ice loss were seen as the most shocking. — 2023 off the charts prepositional phrase1 •Outside of the normal range of measurement; beyond expectations.Advance sales quickly went off the charts. formsmore off-the-charts · most off-the-charts