Down in the dumps
Feeling sad or depressed.

Bite the bullet
To endure a painful situation.

Cry over spilled milk
To be upset about something that has already happened and cannot be changed.

A heavy heart
Feeling sad or sorrowful.

Wear one’s heart on one’s sleeve
To openly show one’s emotions.

In the depths of despair
Feeling extreme sadness or hopelessness.

Every cloud has a silver lining
There is something good in every bad situation.

Shed tears
To cry.

A broken heart
Emotional pain caused by loss or disappointment in love.

Cry one’s eyes out
To cry very hard and for a long time.

Drowning in sorrow
Overwhelmed by sadness.

Heartbroken
Feeling intense grief or anguish.

Feel blue
To feel sad or depressed.

Moody as a rain cloud
Being very changeable in mood, often sad.

Lost in thought
Deeply absorbed in one's own feelings, often sad ones.

Tears of a clown
Hiding sadness behind a facade of happiness.

Walking on eggshells
Being very cautious to avoid upsetting someone who is sad or sensitive.

Sad but true
Acknowledging an unpleasant truth.

In a fog
Confused or unable to think clearly, often due to sadness.

A sad tale’s best for winter
Sad stories are often more appreciated during difficult times.