lie back
To lean or recline on one's back, as in a chair, sofa, or bed. Just lie back, get comfortable, and tell me what's been on your mind lately. All I want to do this weekend is lie back and read my book.
lie back
to relax; to lean back in a chair and relax. (See also kick back.) Just lie back and try to get comfortable. I really need to get home and lie back and relax.