The antonyms for the phrase "crush against" include release, ease, and separate. To release means to set free or let go, and it is the opposite of crushing someone or something. Ease means to reduce discomfort or tension, and it is the opposite of applying force on an object or person. Lastly, separate means to divide or disconnect, and it is the opposite of pressing or crushing things together. In general, the antonyms for "crush against" suggest the idea of relieving pressure, reducing tension, or disconnecting, as opposed to exerting force, pressing or uniting things together.