Take with a Grain of Salt: not to take what someone says too seriously
Example: I’ve seen the article, which I take with a grain of salt.
Taste of your own medicine: If you give someone a taste of their own medicine, you do something bad to someone that they have done to you to teach them a lesson.
Example: He's always interrupting people when they are talking; what he deserves is a taste of his own medicine!
The Ball Is In Your Court: It is your decision this time.
Example: It's up to you what to do - the ball is in your court now.
The Best of Both Worlds: a win-win situation
Example: Jay is working at a financial company and Julie is working at an IT business, so they are the best of both worlds
The Bigger They Are The Harder They Fall: the more important or powerful a person is, the more difficult it is for them when they lose their power or importance
Example: Tom is very bitter about losing his health life. The Bigger he is the harder he falls.
The Last (Final) Straw: one small burden after another creates an unbearable situation.
Example: Losing my job was bad enough, but being evicted was the final straw.
Third Time's a Charm: the third time something is attempted is more likely to succeed than the previous two attempts.
Example: One is sure to succeed at a task or event on the third try. Third time's a charm or third time luck.
Tie the knot: to get married
Example: We have been dating for quite a long time now and are planning to tie the knot a few months from now.
Till the Cows come Home: For a long but indefinite time.
Example: I could dance with you till the cows come home. Better still, I'll dance with the cows and you come home. (Dialogue of the 1933 film Duck Soup)
Tongue in cheek: humour or joke, although you might appear to be serious
Example: My comment was made tongue in cheek (TIC). Don’t take me seriously.
Touch Wood: said in order to avoid bad luck
Example: I have never broken one of my legs, touch wood.
Turn A Blind Eye: refuse to acknowledge something you know is real or wrong
Example: Turn a blind eye and a deaf ear every now and then, and we get on marvellously well.
Twenty three Skidoo: leaving quickly, or taking advantage of a propitious opportunity to leave
Example: Tom is always tired of his partner's noise! Twenty Three Skidoo!