TOMBSTONING Meaning of TOMBSTONING in English tomb·ston·ing /ˈtuːmstəʊnɪŋ $ -stoʊn-/ BrE AmE noun [uncountable] British English the activity of jumping from a high cliff or ↑ pier into water for fun Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012