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sitback (third-person singular simple presentsits back,present participlesitting back,simple past and past participlesat back)

1. Torecline while still in aseated position, with one's back on the frame of the seat.

   Please justsit back and watch the show.

   • 2022 November 30, Paul Bigland, “Destination Oban: a Sunday in Scotland”, inRAIL, number971, page75:

     The line along the Northumbrian coast to Berwick and into Scotland is stunning (even on a Voyager!), and the weather is perfect - justsit back, relax, and enjoy the motion picture that plays beyond the window.

2. (idiomatic) Torelax, to notexert oneself.
   • 2010 December 28, Marc Vesty, “Stoke 0 - 2 Fulham”, inBBC‎^[1]:

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

• sit back on one's heels