“A safe bet”

“Better safe than sorry”

It’s better to be cautious than regret later.

“When pigs fly”

Something that will never happen.

“Get cold feet”

To become nervous and change your mind.

“Kill two birds with one stone”

To achieve two goals with one action.

“Raining cats and dogs”

Raining very heavily.

“A picture is worth a thousand words”

An image can express more than words.

“Better late than never”

Doing something late is better than not doing it at all.

“Wrap one's head around something”

To understand something complicated.