Also means
to harden (emotionally)
Usage Note
Blinder in the literal sense means to fit a vehicle or door with armour plating ('une porte blindée' = 'a reinforced/armour-plated door'). Figuratively, se blinder means 'to toughen oneself up' or 'become hardened' to unpleasant things. The adjective blindé ('armoured') is very common on its own.
Examples
"Ils ont blindé les portes du coffre-fort."
Natural Translation
They reinforced the doors of the safe.
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