tsęlâ‘, 'side, rib'
'Hebrew Thoughts' from Jonathan Went
The word c"lF) tsęlâ‘ "side, rib" (Strong's #6763, x41) comes from the verb cFlA) tsâla‘ "to curve, limp, be lame, incline to one side" (Strong's #6760, x4) in the AV translated each time by "halt" by other versions as "limp, lame"