rein
UK[reɪn]US[reɪn]
n
A long, narrow strap attached at one end to a horse's bit, used by a rider or driver to guide and control the horse.
n
The power to direct and control something.
v
To check, guide, or control something, typically by means of restraint.
Etymology
The word 'rein' entered English in the 13th century from the Old French 'rene', meaning 'a strap fastened to an animal's bit'. The Old French term derived from the Latin 'retinere', meaning 'to hold back, retain'. This Latin source is a combination of 're-' (back) and 'tenere' (to hold), vividly illustrating the core function of a rein: to hold a horse back. Over time, the concrete meaning of the leather strap was naturally extended to the abstract sense of exercising guidance, restraint, or control over any situation or activity.
Analysis
The word 'rein' is a simplex word borrowed from Old French. It cannot be meaningfully segmented into smaller, independent morphemes within its modern English spelling.
Examples
She pulled gently on the left rein to guide the horse through the gate.
The new CEO was given free rein to restructure the struggling company.
The government must rein in public spending to curb inflation.