Opposite words for pressure :
One great pressure was lifted. "A Singer from the Sea", Amelia Edith Huddleston Barr.
You don't know what it means to be subject to the constant pressure of a strong man who loves you. "Masterman and Son", W. J. Dawson.
If during life the beak was pressed with the finger it became quite white, and it was not until the pressure had for some time been removed that the colour returned. "Journals Of Two Expeditions Of Discovery In North-West And Western Australia, Vol. 1 (of 2)", George Grey.
" Then I don't care for anything either," she cried, clinging to him, and drawing her arm so tight about his neck that the pressure of his body fairly robbed her of her breath. "The Song of Songs", Hermann Sudermann.