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noun
1.
a shaped covering for the head, usually with a crown and brim, especially for wear outdoors.
2.
Roman Catholic Church.

the distinctive head covering of a cardinal.
the office or dignity of a cardinal.
Compare red hat.

verb (used with object), hatted, hatting.
3.
to provide with a hat; put a hat on.
Idioms
4.
hat in hand, humbly; respectfully:
He approached the boss, hat in hand.
5.
pass the hat, to ask for contributions of money, as for charity; take up a collection:
The lodge members passed the hat to send underprivileged children to summer camp.
6.
take off one’s hat to, to express high regard for; praise:
We took off our hats to their courage and daring.
7.
talk through one’s hat, to speak without knowing the facts; make unsupported or incorrect statements:
He is talking through his hat when he says he’ll make the team.
8.
throw / toss one’s hat in / into the ring, to become a participant in a contest, especially to declare one’s candidacy for political office:
His friends are urging him to throw his hat in the ring.
9.
under one’s hat, confidential; private; secret:
I’ll tell you the real story, but keep it under your hat.
10.
wear two / several hats, to function in more than one capacity; fill two or more positions:
He wears two hats, serving as the company’s comptroller as well as its chief executive officer.
noun
1.

any of various head coverings, esp one with a brim and a shaped crown
(in combination): hatrack

2.
(informal) a role or capacity
3.
at the drop of a hat, without hesitation or delay
4.
(informal) I’ll eat my hat, I will be greatly surprised if (something that proves me wrong) happens: I’ll eat my hat if this book comes out late
5.
hat in hand, humbly or servilely
6.
keep something under one’s hat, to keep something secret
7.
(interjection) (Brit, informal) my hat

my word! my goodness!
nonsense!

8.
old hat, something stale or old-fashioned
9.
out of a hat

as if by magic
at random

10.
pass the hat round, send the hat round, to collect money, as for a cause
11.
take off one’s hat to, to admire or congratulate
12.
talk through one’s hat

to talk foolishly
to deceive or bluff

13.
(Irish) throw one’s hat at it, to give up all hope of getting or achieving something: you can throw your hat at it now
14.
throw one’s hat in the ring, toss one’s hat in the ring, to announce one’s intentions to be a candidate or contestant
verb hats, hatting, hatted
15.
(transitive) to supply (a person, etc) with a hat or put a hat on (someone)
hat

noun

A condom (1990s+ Teenagers)

Related Terms

brass hat, gimmie hat, hard hat, here’s your hat what’s your hurry, high-hat, knock something into a cocked hat, old hat, party hat, pass the hat, shit in your hat, straw hat, talk through one’s hat, throw one’s hat in the ring, tin hat, under one’s hat, wear two hats, white hat, wool hat

A common (spoken) name for the circumflex (“^”, ASCII 94) character.
See ASCII for other synonyms.
[Jargon File]

Chald. karb’ela, (Dan. 3:21), properly mantle or pallium. The Revised Version renders it “tunic.”

hat in hand
hat in the ring
hat trick