The phrase "touch lips" can be replaced by a variety of synonyms, each with its own unique connotations and implications. For instance, "kiss" is a more passionate and romantic term, while "peck" is a more light-hearted and friendly term. "Nuzzle" suggests a more affectionate and playful gesture, while "graze" implies a more fleeting and accidental touch. "Lock lips" is a more forceful term, while "brush" suggests a gentler and more delicate touch. Ultimately, the choice of synonym depends on the context and the desired tone of the situation.