fight (someone/something) tooth and nail

to use a lot of effort to oppose someone or achieve something.

We fought tooth and nail to keep our share of the business.

They vowed to fight the new legislation tooth and nail.

• tip your hand
• tire of
• tire of someone
• tire of something
• tire out
• tire you out
• tit for tat
• tit-for-tat
• tittle-tattle
• to advantage
• to a fault
• to a fine art
• to all intents and purposes
• to a man
• to and fro
• toast of
• toast of somewhere
• to a tee
• to begin with
• to be on the safe side
• to be said for
• to be said for doing something
• to be said for something
• to be sneezed at
• to be sniffed at