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He is a night owl
someone who is active at night, comparing their behavior to that of a night-active bird.
A roller coaster of emotions
A person's fluctuating emotional state to the ups and downs of a roller coaster.
A heart of gold
Someone who is kind, generous, and compassionate, comparing their inner qualities to the preciousness of gold
The world is a stage
People's lives are like performances on a stage, with individuals playing different roles and acting out their lives.
Life is a journey
Life's experiences and challenges to a travel path, emphasizing the ongoing nature of life and its many twists and turns.
Time is a thief
Time is destructive and can steal things away, often used to express the feeling of time passing quickly or the loss of something valuable.
Time is money
The value of time and the need to use it efficiently, similar to how one would manage money.
A walking dictionary
Compares the person to a dictionary, not literally, but to suggest they possess a vast and comprehensive knowledge of words and language.
A fish out of water
Feeling uncomfortable in a new or unfamiliar situation.
Laughter is medicine
Laughter can have a therapeutic effect, similar to how medicine can cure or alleviate illnesses.
The classroom was a zoo
The chaotic and lively nature of the classroom to a zoo
Heart of stone
An inflexible and unfriendly or unkind disposition.
She is an open book
she has nothing to hide
Nitpicking
bringing attention to tiny faults
Step up to the plate
to take action when needed
My dogs are barking
my feet hurt
To hit the sack
to go to bed
To bite the bullet
to do something unpleasant quickly and with force, so as to have it be over quickly.
To cut corners
to do something poorly so as to save time or money
A wild-goose chase
a pointless or hopeless endeavor