drop (one's) guard

To become less guarded or vigilant; to stop being cautious about potential trouble or danger. We'll wait long enough for them to drop their guard before we launch our invasion. There will always be people in this business looking to exploit you, so you can never drop your guard.

Common Names:

Name	Pronounced	Usage
Paquita	-	Spanish
Kwesi	-	Western African, Akan
Rick	RIK	English
ZÉPhyrine	-	French (Rare)
Peg	PEG	English
Kapena	-	Hawaiian