Here is our list of American idioms that start with "H":

(I've/he's/you've, etc...) had it: Said when you've had enough of a situation, when you're endured all that you could. Example: "I've had it with their daily parties. I haven't been able to sleep well for weeks!"

Half-baked (adj.):
Foolish. Example: "He came up with a half-baked plan to win back his girlfriend."

Hand-me-down (adj.):
Usually said of clothing that has been passed on from one person to another. Example: "A hand-me-down dress"

Hands down:
Easily; by far. Example: "She is hands down the most beautiful girl in class."

Hang in there!: This basically means "don't give up!"

Hang on:
To wait (for a short time); to hold on. Example: "Hang on. Let me just finish this email and I'll be right with you."

(To) hang on someone's every word:
To listen very carefully to someone. Example: "Grandpa was telling a story and the kids were hanging on his every word."

Hassle (n.): A problem; Something that is inconvenient, problematic for you. Example: "I had to go back to that office three times to get things done... What a hassle!"

Hassle (v.): To bother; To nag. Example: "Stop hassling him about that!"

(To) hate someone's guts:
To hate someone very much.

Hate (someone/something) with a passion: To hate (someone/something) very much.

(To) have a big mouth:
To be a gossiper. To be a person who can't keep a secret. Example: "Don't tell my cousin any secrets. She has a big mouth."

(To) have a lot going for (someone):
To have a lot of good things in one's life; to have many things working to one's benefit. Example: "She has a lot going for her: she's smart, she's attractive, and she has a good job."

(To) have a sweet tooth:
To love to eat candy or other sweets.

(To) have an edge:
To have an advantage. Example: "When it comes to speed, he has an edge over the other players."

(To) have mixed feelings (about something):
To be unsure or uncertain about something. Example: "Some of the partners had mixed feelings about the merger."

(To) have one's hands full:
To be busy, occupied with some kind of activity, work, etc. Example: "I have my hands full with my three children."

(To) have one's heart set on something:
To really want (and/or expect) something to happen. Example: "Julie has her heart set on going to London this summer."

Have the hots for (someone): To be physically attracted to (someone); Example: "She's got the hots for her new co-worker."

Hick (n.): A redneck; a backwards, ignorant person with a very limited intelligence.

High (adj.): Intoxicated on drugs. Example: "He looked and behaved like he was high."

(A) hit:
A popular song or film. A success. Example: "Every song they put out becomes a hit."

(To) hit the spot:
To satisfy a need exactly. To be exactly right (often said about food or drinks). Example: "That was a delicious meal. It hit the spot."

(To) hit bottom:
To reach the lowest point. Example: "Two years after he started to abuse alcohol, he hit bottom."

(To) hit the road:
To leave, start on a trip, etc. Example: "It's already 9:00 AM. We have to hit the road!"

(To) hit a snag:
To run into a problem. Example: "The project hit a snag when testing failed to produce favorable results."

Hit on (someone) (v.) : To try to seduce (someone); To put the moves on (someone). Example: "Bob was hitting on me last night."

Hit the sack (v.) : To go to bed. Example: "I'm going to hit the sack. I'm really beat."

Hold on!
Wait. Example: "Hold on, I'll be with you in just a moment."

(To be) homesick
To miss one's home, country, city, etc. Example: "Francesca is really homesick. She really wants to go back to Italy."

Hoodie: A hooded sweatshirt. Example: "My mom bought me a black hoodie at the GAP."

Hooker (n.): Prostitute.

Hoopla (n.): see "Hype" below.

Hot (adj.): Physically attractive.

Hottie (n.): Very attractive man or woman. Example: "Lisa is such a hottie."

How on earth...? How in the world...?
When asking a question, "How on earth..." and "How in the world..." emphasize the fact that something incredible or very hard to believe happened. Example: "How on earth did you get that job? (it was very hard to get)"; "How on earth did you fix that car!? (it was impossible to fix)".

(To be) hung up on (v.): (to be) obsessed/ overly interested in something. Example: "He's really hung up on his looks." (He's really obsessed with the way he looks.)

Hype (n.): Extreme promotion and the commotion that follows; Hoopla. Example: "That CD doesn't live up to the hype." (That CD isn't as good as they're promoting it to be/ as good as everything says it is).

Hyped (adj.): Really excited. Example: "We're all hyped about the concert next weekend."