What is another word for "plunge"?

Roget's Thesaurus (1911) lists these synonyms for "plunge": about, abysmal, activity, add, adventure, affuse, affusion, and, ankle, anvil, apprentice, aqua, aquatic, aqueous, are, balneal, balneation, bath, bathe, bathometer, bathymetry, begin, beginning, benthal, betake, beyond, bottomless, break, broach, business, call, cast, chaste, come, common, commonplace, compact, concavity, contract, crater.