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сидеть сложа руки stresses
gen.	not to do a hand's turn; let the grass grow under feet; sit at home; twirl thumbs; rest on oars (Anglophile); sit back and do nothing (Anglophile); sit idly by (ART Vancouver); sit on one's hands; snudge; sit around (This is a really cushy job. Mostly I just sit around drinking tea. Alba Owl); idle one's time away (Anglophile); sit lazily (Ремедиос_П); sit by (Bullfinch)
Gruzovik	sit with arms folded
Игорь Миг	not to walk the walk; not to move hand or foot; not to lift a finger; stand idly by
Gruzovik, fig.	be idle
idiom.	sit idle (Andrey Truhachev)
inf.	sit on one's hands (I figured you weren't just sitting on your hands all this time.)
Makarov.	lie back; sit by; be idle; let the grass grow under one's feet; not to do a stitch of work
proverb	let the grass grow under one's feet; not to do a hand's; sit twiddling one's thumbs
сидеть, сложа руки
Игорь Миг	sit by passively
сидят сложа руки
gen.	sitting on hind quarters (tfennell)
сидеть ждать сложа руки
sec.sys.	sit on one's thumbs (Artjaazz); sit on one's hands (Artjaazz)

сидеть сложа руки: 12 phrases in 5 subjects

General	6
Idiomatic	1
Informal	1
Makarov	3
Politics	1