What is another word for springing on?
Pronunciation: [spɹˈɪŋɪŋ ˈɒn] (IPA) 
The phrase "springing on" is often used to describe a sudden or unexpected action that catches someone off guard. Some synonyms for this phrase include ambushing, surprising, startling, jumping, pouncing, lunging, and leaping. These words imply a sudden and forceful movement that can cause someone to feel startled or caught off guard. Using these synonyms can add depth and interest to your writing or speech, helping you to convey a strong sense of action and urgency. Whether you are describing a sudden attack or a surprise announcement, these words can help you to convey the emotion and energy associated with this kind of abrupt action.
