Scare the life out of (one) informal verb phrase
To make someone feel very frightened or shocked suddenly and/or severely
The gunfire scared the life out of me last night.
He jumped out of the shadows, trying to scare the life out of us.
We'll scare the life out of him, and then he won't bother your mom anymore.
Oh John, you scared the life out of me!
To shake a lot due to the cold or fear
Being so scared, confused, and astonished that you can't think or do anything.
I'm not stupid or easily scared.
Feel extremely scared or frightened
The verb "scare" should be conjugated according to its tense.
This phrase emphasize that Christmas takes place once a year time, so you should grab this chance to indulge yourself and be good to others.
I've eaten a little more than usual as today is Christmas and Christmas comes but once a year, right?