noun

strong criticism.

you must be strong enough to take the flak if things go wrong

criticism,censure,disapproval,disapprobation,hostility,complaints,castigation,condemnation,denunciation,opprobrium,obloquy,calumny,calumniation,execration,excoriation,vilification,abuse,revilement,lambasting,brickbats,knocking,panning,slamming,tongue-lashing,a bad press,stick,verbal,slagging off,slagging