hat
at the drop of a hat: seedrop.
be all hat and no cattle tend to talk boastfully without acting on your words. US informal
black hat (or white hat) used in reference to the bad (or good) party in a situation.
☞ This idiom refers to the colour of the hats traditionally worn by the bad (or good) characters in cowboy films.
hang your hat: seehang.
hats off to - used to express admiration for someone who has done something praiseworthy. British
hold (or hang) on to your hat! said as a humorous warning that conditions are about to become more difficult or hazardous.
2008Guardian Hold on to your hats, Hearts fans, Bertie Vogts is keen to return to Scotland and is heading for the Tynecastle manager's office.
I'll eat my hat: seeeat.
keep something under your hat keep something a secret.
old hat: seeold.
pass the hat round collect contributions of money from a number of people for a specific purpose.
pick something out of a hat select something, especially the winner of a contest, at random.
pull one out of the hat bring off an unexpected trick in an apparently desperate situation.
☞ The image here is of a rabbit pulled out of a magician's hat.
1971James McClureThe Steam Pig I must say you've really pulled one out of the hat this time.
pull a rabbit out of the hat: seerabbit.
take your hat off (or raise your hat) to state your admiration for someone who has achieved something. British
☞ The image here is of the gesture of briefly removing your hat as a mark of courtesy or respect to someone.
talk through your hat: seetalk.
throw (or toss) your hat in (or into) the ring indicate willingness to take up a challenge or enter a contest.
2007K. D. AckermanYoung J. Edgar He announced … that he was tossing his hat in the ring as a candidate for president of the United States.
tip your hat: seetip.
wearing your - hat (or with your - hat on) used to indicate that someone is speaking or acting in a particular, especially professional capacity.
2013Bruce BondPassing Professional Skills Tests for Trainee Teachers You are there as a teacher, not a friend. Remain professional throughout and always have your teacher's hat on.