"Seep away" means to slowly escape or leak out of something. There are several synonyms for this phrase, including "drain away," "trickle out," "ooze out," "ebb away," and "leech out." These words all suggest a gradual and steady loss of something, whether it be liquid, energy, or time. They can be used to describe anything from a leaking faucet to the slow fading away of a relationship. By using these synonyms, writers and speakers can add variety and nuance to their language, painting a more vivid picture of the process of slow, steady loss.