Dictionary.com
definitions

sit back

verb

(intr, adverb) to relax, as when action should be takenmany people just sit back and ignore the problems of today
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Related Words for sit back

unwind, recline, soften, calm, repose, rest, tranquilize, laze, unbend, unlax, quieten
Idioms and Phrases with sit back

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.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.