The antonyms for the phrase "goes out one depth" refer to the idea of going deeper or going inward. Some possible antonyms could include "dives in," "plunges," "descends," "sinks," "immerses," "penetrates," or "engages with." These terms all suggest a movement towards a deeper level of understanding or experience, whether that be intellectual, emotional, or physical. In contrast to "going out one depth," which implies a surface-level engagement with a topic or relationship, these antonyms suggest a desire to delve more deeply and to truly explore the depths of a situation or idea.