Idioms about prediction

A fallen leaf indicates the coming of autumn.

You can tell that autumn is coming when you see the yellow leaves on the ground. Metaphor can predict the development and change of the situation through some signs.

Preservation or destruction is unpredictable.

B: guess, estimate. Whether it is life or death, it is unpredictable.

Things or situations are often unpredictable.

The situation is unpredictable. Metaphor things or situations are as unpredictable as changeable situations.

A person's fate hangs in the balance.

Good luck: good luck, extended to good luck, success or failure; Divination, extended to prediction. Whether this is a blessing or a curse, success or failure, is unpredictable.

Uncertainty, unpredictability

Variable and unpredictable.

Be prepared for all possible things.

Defense: preparedness; Test: predict. Used to guard against unexpected things.