Used in the context of general equities. Make a good-sized market in the trader's own bid and offering prices . Hence, standing up to the bid signifies the trader's willingness to buy size (i.e., 50m) volume at his advertised bid, even if the customer buyer/seller falls down .
STAND UP TO
Meaning of STAND UP TO in English
Campbell R. Harvey. Hypertextual finance English glossary. Английский словарь гипертекстовых финансов. 2012