The phrase "strike at" often implies an attack or a sudden blow that targets someone or something. In order to convey a similar idea, some synonyms that could be used include "assault," "smite," "hit," "slap," and "thrash." Other words that could be utilized to describe this action include "strike against," "poke," "jab," "butt," and "ram." Depending on the context and tense of the sentence, other synonyms such as "bump," "collide," "punch," and "knock" may also be appropriate. It's important to choose the right word depending on the tone and intended meaning of the sentence.