Tread on someone’s toes: To upset or offend someone.

Tread the boards: When someone treads the boards, they perform on stage in a theatre.

Tread water: To be active but not make any progress in the work you are trying to do.

Treasure trove: A great source of something or to be of great value.

Tried and tested: If a method has been tried and tested, it is known to work or be effective because it has been successfully used long enough to be trusted.

True blue: A very reliable and loyal person.

True colours: When you show your true colours, you are revealing what you really are like and reveal your real character. It usually implies that a negative or weak aspect of a person’s personality is revealed as a result.

Trump card: Something that is advantageous and is held back to be used at a crucial time.

Tug at the heartstrings: Something that makes you feel sad or sympathetic.

Turf war: A dispute where one party seeks to gain more influence than the others, such as gangs fighting over the right to operate within a particular area.

Turn a blind eye: When people turn a blind eye, they deliberately ignore something, especially if people are doing something wrong.

Turn a deaf ear: Not to listen to someone or pay much attention to what someone is saying.

Turn a new leaf: To change one’s behaviour and stop doing what they were doing, usually when someone stops doing wrong things and becomes a good person.

Turn something on its head: To turn something upside down or reverse something.

Turn the corner: To get over a bad phase or recover from a bad experience.

Turn the crack: If you turn the crack, you change the subject of a conversation.

Turn the other cheek: To be so humble and polite that when someone insults you or gets angry with you, you do not retaliate.

Turn the tables: When the situation changes completely, usually when the weaker position becomes the dominant one.

Turn turtle: When something, like a car, turns upside down.

Turn water into wine: If someone turns water into wine, they transform something bad into something excellent.

Turn your nose up: To reject something out of snobbishness, because you think it is not good enough.

Turn up one's toes to the daisies: If someone has turned up their toes to the daisies, it means that the person died.

Turn-up for the books: An unexpected and surprising event.

Twenty-four seven: It means all the time, 24 hours a day, seven days a week.

Twinkling of an eye: Very quickly.

Twist someone’s arm: To put pressure on someone to do what you want him to do.

Twisting in the wind: To be twisting in the wind is to be without support or help from anyone.

Two cents: To add your two cents is to give your views/opinion on a given issue.

Two heads are better than one: It means that when two (or more) people work together, more can be accomplished by their combined effort.

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Left is Right