trouble, n. and v.
The noun and verb senses of this word arose simultaneously ca. 1200 from the same origin language: Old French. The verb is from OF trubler, a metathesis of turbler, "to disturb, muddle, or mix". The noun is from OF truble, "disturbance, turmoil", which is itself derived from trubler as above.
The Old French is derived from Latin turbulare, "to make turbulent, to agitate", which itself is from the Latin adjective turbidus, meaning "muddy, clouded, full of confusion". The Latin is also the source of Modern English turbid and turbulent/turbulence, as well as disturb, perturb, and turbine. From Old French truble, tribulation is also derived through the Anglo-French intermediary tribul.














