He rose from humble beginnings.
There is no need to worry about coming from a family of low rank.
下賤 refers more directly to low social class or menial status, and can be more derogatory than 微賤.
Standard kanji form for this word.
Variant with irregular kanji usage; 賎 is a less common form of 賤.
Compound of 微 (bi, 'slight, humble') and 賤 (sen, 'lowly, base'). The exact historical derivation is uncertain, but the word follows classical Chinese-influenced word formation.