There are a variety of synonyms for the phrase "stretch out." Some common alternatives include "extend," "lengthen," "prolong," "elaborate," and "expand." Each of these terms can be used to describe the act of making something longer or larger. For example, one might "stretch out" their arms to reach for something, or they might "extend" their hand to shake someone else's. Similarly, an artist might "prolong" the final note of a song, or a writer might "elaborate" on a particular point in their argument. As such, these synonyms offer a flexible and nuanced language to describe different kinds of expansion and extension.