fight against or resist strongly; "The senator said he would oppose the bill"; "Don't fight it!"
If you fight back against someone or something that is attacking or harming you, you resist them actively or attack them. The teenage attackers fled when the two men fought back We should take some comfort from the ability of the judicial system to fight back against corruption
If you fight back an emotion or a desire, you try very hard not to feel it, show it, or act on it. She fought back the tears