Meaning of DE- in English
de- /diː, dɪ/ BrE AmE prefix
[ Language: Old French ; Origin: Latin de- 'from, down, away' and Latin dis- 'apart' ]
1 . shows an opposite:
deindustrialization (=becoming less industrial)
2 . shows that something is removed:
Debone the fish (=remove its bones) .
The king was dethroned (=removed from power) .
3 . shows that something is reduced:
The government have devalued the currency.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012