Slip under the/(one's) radar idiom
If someone slips under the/(one's) radar, he or she does something bad or illegal without being noticed or detected.
I can't believe that the former sheriff has let corruption slip under his radar for years.
The company has many strict rules to not allow employees to slip under their radar.
How did you slip under the radar at work?
The verb "slip" should be conjugated according to its tense.
This idiom comes from the military contexts, where aircraft would fly low to avoid being detected by radar.
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.