Locks in or locking in refers to the act of securing, sealing, or restricting access to something. The antonyms for this phrase include release, open up, free, let go, and loosen. When we say release or free, we mean to remove constraints or restrictions, thus enabling accessibility or movement. Open up or let go, on the other hand, implies the act of creating space or room for new opportunities, change, or growth. Loosen, on the other hand, denotes the act of making something less tight, firm or rigid. In conclusion, understanding these antonyms can help us use the right word in the right context and communicate effectively.