ADV

still
Just sit still!
quietly
He would sit quietly and watch what was happening
comfortably
in silence
We sat in silence for a few moments
cross-legged, with your legs crossed
The children sat cross-legged on the floor. She was sitting in her favourite chair with her legs crossed
(bolt) upright
He sat bolt upright, hands folded in front of him
demurely, primly
She sat demurely on the edge of her chair
back, down
side by side, together

VERB + SIT

let sb
Surely someone would stand up and let her sit down?
gesture for/ to sb to, motion (for/to) sb to
He motioned the young officer to sit down

PREP

astride
sitting astride a horse
at
He was sitting at his desk
beside
She went and sat beside him
in
He sat back in his chair and started to read
on
Can I sit on this chair?
opposite
They sat opposite each other

ADV

comfortably, easily, well
uneasily

PREP

with
His views did not sit comfortably with the management line