[ no passive ]
1.
(not used in the progressive tenses) to be an abbreviation or symbol of sth :
'The book's by T.C. Smith.' 'What does the 'T.C.' stand for?'
2.
to support sth :
I hated the organization and all it stood for (= the ideas that it supported) .
3.
not stand for sth to not let sb do sth or sth happen :
I'm not standing for it any longer.