ferré
iron-shod, metaled (of a road)
adjective feh-REH Rare
Origin: Latin ferratus, from ferrum (iron)
Also means
well-versed, expert (in a subject)
Usage Note
Ferré literally describes something fitted with iron — voie ferrée (railway, literally 'iron-shod track') is the most common use. Figuratively, être ferré sur un sujet means to be very knowledgeable or well up on a topic, an informal but common expression. The feminine is ferrée.
Examples
"La voie ferrée longe la rivière."
Natural Translation
The railway line runs along the river.
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