big gun (noun) big deal: something or someone important
Sinonime: altercate, argue over, argufy, avoid, bicker, blow hot and cold, carp, catch at straws, cavil, chicane, criticize, dispute, equivocate, evade, fence, flip-flop, hassle, have at it, hem and haw, hypercriticize, make a big thing about, niggle, nit-pick, nitpick, paralogize, pick to pieces, pretend, prevaricate, put up an argument, set to, shift, spar, split hairs, squabble, talk back, waffle, wrangle