"At this second" is a phrase that is commonly used to indicate the current moment or a precise point in time. However, there are other alternatives to this phrase that can be used to convey the same meaning. Some synonyms for "at this second" include "right now," "instantly," "immediately," "this moment," "in the blink of an eye," "presently," and "currently." These phrases are all useful in different contexts and can be used to add variety to your writing or speaking. The choice of synonym will depend on the tone and context of the sentence, and which phrase will best convey the intended meaning.