The phrase "in out" can have a variety of synonyms depending on the context. If referring to movement, synonyms may include entering and exiting, coming in and going out, or penetrating and withdrawing. In a sexual connotation, synonyms for "in out" may include thrusting and penetration. In a business or organizational context, synonyms might include inclusion and exclusion, accepting and rejecting, or admitting and expelling. Other potential synonyms could include switching between two states or positions, such as flipping or toggling between on and off, or oscillating between in and out.