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general::
noun ADJ. big, huge, serious VERB + QUESTION MARK put His arrival clearly puts a huge question mark against the future of the present team captain. QUESTION MARK + VERB hang over sth, remain A big question mark hangs over the wisdom of the move. PREP. ~ against A slight question mark against her character remains. | ~ over There is now a serious question mark over his leadership ability.
Oxford Collocations Dictionary