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
Hann	-	Medieval English
Kyo	kyo:	Japanese
Wilburh	-	Anglo-Saxon
Yirmiyahu	-	Biblical Hebrew
Hamm	[hæm]
Tamrat	-	Eastern African, Amharic