overtopping /əʊvəˈtɒpɪŋ/adjective 1noun 1forms 3 adjective1 •Surmounting, surpassing.And he never said a word to her against her mother – he only remained dumb and discouraged in the face of her ladyship's own overtopping earnestness. — 1897 noun1 •An instance of water going over the top of a barrier such as a sea wall or levee.Around 34 miles of the Wales Route's coastal lines are vulnerable to overtopping, coastal erosion and storm surges. — 2020 formsovertoppings · more overtopping · most overtopping