de profundis
Concise Oxford English Dictionary © 2008 Oxford University Press:
de profundis /ˌdeɪ prəˈfʊndɪs/
▶adverb expressing one's deepest feelings. ▶noun a heartfelt appeal.
– origin L., ‘from the depths’, the opening words of Psalm 130.
'de profundis' also found in these Oxford entries:

