noun
: a person or factor of outstanding importance especially in some particular relation
a big gun in the diplomatic corps
ecology may be the big gun in the battle to keep the world's wild animals alive — W.A.Bridges
noun
: a person or factor of outstanding importance especially in some particular relation
a big gun in the diplomatic corps
ecology may be the big gun in the battle to keep the world's wild animals alive — W.A.Bridges
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012