From top to bottom phrase
Do something completely and thoroughly; to every part of something
On Sundays, my family cleans the house from top to bottom.
The police were searching for the lost child from top to bottom.
We intend to paint the room blue from top to bottom.
She tidies up her room from top to bottom.
If you swallow the bait, you take something that someone offers you, or agree to do something that someone asks you to do without knowing that it is a trick or way of getting something from you.
You can't just do whatever he wants you to do. Don't swallow the bait.