Onrushing refers to something that is approaching rapidly or swiftly. Some synonyms for onrushing include charging, advancing, attacking, storming, rushing, and assaulting. These words all convey the sense of something coming quickly or forcefully towards a target. Other synonymous terms that describe an onrush could include surging, pressing, driving, barreling, hustling, and pouncing. The use of a synonym can enhance a writer's language and lend a more descriptive tone to a piece of writing. By exploring the various options when it comes to synonyms for onrushing, a writer can choose the best term to precisely convey the intended meaning.