Big boots to fill

To take over a job that someone else used perform in an impressive way. (‘Big shoes to fill” is also used.) 

“Our new teacher has big boots to fill, because our former teacher was so great!”

Tall order

Something that is difficult to achieve or fulfill is a tall order. 

”His doctor advised him to rest for a month but to him it’s a tall order considering his hectic business schedule.”

Two heads are better than one

When two people work together more things get accomplished. 

“I need your advice to improve our services. Two heads are better than one.”

Hit pay dirt

To hit pay dirt is to discover something of value. 

“The men hit pay dirt when they discovered oil in the farmer's field.”

Go ape

To go ape is to become very excited or enthusiastic. 

“I go ape over Christmas sales.”

Hold a grudge

To hold a grudge is to have a deep-seated feeling of resentment or rancor against another.   

“He holds a grudge against the manager for having reprimanded him in public.”

Hive of activity

It is a place where people have a lot of things to do.

“The cafeteria is a hive of activity at lunch time.”

Hit-and-run

This is an accident where the driver of a motor vehicle that struck a pedestrian or another vehicle flees the scene to avoid apprehension. “

The young boy was crossing the street when he was involved in a hit-and-run accident.”

Hook, line, and sinker

If somebody accepts or believes something hook, line, and sinker, he accepts it completely and without any reservation. 

“I don’t have any bad record at school so the principal accepted my explanation as to why I had been absent hook, line, and sinker.”

House of cards

This refers to a weak and fragile structure, plan, or situation that’s badly put together and can be easily knocked down.

“The plan to put up a farmers’ cooperative was made without consulting the farmers.  It seems like a house of cards.”

Hot under the collar

If you're hot under the collar, you’re angry or bothered.  

“The  accountant is hot under the collar because some checks are missing.”

Hot headed

He is one who is easily angered. 

It’s difficult to work for a hot-headed employer.”

Hold your tongue

 

Be quiet, wait for your turn to speak.

 

“The lecturer is still talking. Hold your tongue until the open forum.”

Hold your breath

To hold your breath is to wait excitedly or anxiously for something to happen.

 

“I held my breath as he made a free throw.”

 

 

 

 

 

 

 

 

Hold out the olive branch

To hold out the olive branch is to make a peace offering.

 

“After our heated argument, my neighbor held out an olive branch and invited me to dine with his family.”

 

 

 

 

 

 

 

 

 

Snug as a bug in a rug

This is someone who feels very cozy, warm and comfortable. 

”My little brother was as snug as a bug in a rug in his new room.”

Hit the road

To hit the road is to begin a journey.  (‘Hit the trail’ is also used.) 

“We should hit the road early tomorrow morning if we want to reach the seashore before evening.”

Head is in the clouds

If a person has his head in the clouds, he has unrealistic and impractical ideas.  

“Don’t consult him about your problem, his head is in the clouds.”

High-wire act

 A high-wire act 

A high-wire act is a dangerous or risky strategy, plan, task, etc. 

”Our new marketing plan is a high-wire act.”

High spirits

To be in high spirits is to have much energy, to be cheerful. 

”The children were in high spirits as they prepared for the summer camp.”

Hide/bury one's head in the sand

To hide/bury one’s head in the sand is to intentionally keep yourself from knowing or discussing something dangerous or unpleasant.  

“She doesn’t like to talk about the accident. She hides her head in the sand whenever the topic comes up.”

Herding cats

This is a task that is extremely difficult or impossible to do, due to one or more variables being in flux and uncontrollable.  

“When I accepted the assignment I didn’t know that I’d be herding cats.”

Heart of gold

One who has a heart of gold is a genuinely kind, caring, and generous person. 

             “Mother Theresa had a heart of gold.”