sit back
1. To relax in a sitting position. Now, just sit back and enjoy the movie!
2. To stand aside and refrain from acting or intervening. They may not have broken the law themselves, but the CEOs certainly sat back and allowed these illegal activities to happen unchecked. I feel so guilty for sitting back while my son was going through such a difficult time in his life.
sit back
to push oneself back in one's seat; to lean against the back of one's seat. Please sit back. I can't see around you. I sat back and made myself comfortable, assuming that the movie would bore me to sleep.
sit back
1. Relax, as in Now that the work's finished, we can just sit back.
2. Refrain from interfering or taking part, as in Mom and Dad just sat back and watched Meg try to decide whether or not she should tell on her friends . [Mid-1900s] Also see sit by.
sit back
v. To relax or rest in a sitting position, especially by leaning against a backrest or headrest: After the plane took off, I sat back and fell asleep.