sit back

sit back (third-person singular simple present sits back, present participle sitting back, simple past and past participle sat back)

1. To recline while still in a seated position, with one's back on the frame of the seat.

   Please just sit back and watch the show.

2. (idiomatic) To relax, to not exert oneself.
   • 2010 December 28, Marc Vesty, “Stoke 0 - 2 Fulham”, in BBC‎:

     Predictably in the second half it was the Potters, who went searching for goals as Fulham sat back to defend their lead.