Nomen

die Nachrüstung

retrofitting, upgrade, rearmament

Die Nachrüstung des alten Gebäudes ist teuer.

The retrofitting of the old building is expensive.

Die politische Debatte über die Nachrüstung geht weiter.

The political debate about rearmament continues.

the retrofitting/upgrade ((of sth.)) Die Nachrüstung von alten Computern ist oft nicht sinnvoll.

Modernisierung (modernization), Aufrüstung (armament)

From 'nach-' (after, subsequent) and 'Rüstung' (equipment, armament). It means to equip something after its initial production.

Think of adding 'Rüstung' (equipment) 'nach' (after) the fact. This applies to both technology and military contexts.

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