overturn /ˌəʊvə(ɹ)ˈtɜː(ɹ)n/verb 5noun 2forms 5 verb5 •To turn over, capsize or upset.We also found that the only emergency egress from the tram was by smashing the front or rear windscreens, and that emergency lighting had failed when the tram overturned. — 2021 •To reverse (a decision); to overrule or rescind.In a report for the Sun on Sunday, Barak claimed that Andrew is consulting lawyers about overturning that settlement. — 2023 •To overthrow or destroy. •To diminish the significance of a previous defeat by winning; to make a comeback from. •To undergo a limnic eruption, where dissolved gas suddenly erupts from the depths. noun2 •A turning over or upside-down; inversion. •The overturning or overthrow of some institution or state of affairs; ruin. formsoverturned · overturning · overturneth · overturns · overturnest