off (one's) guard

Not being especially careful or vigilant; not prepared for danger or surprises; being careless or inattentive. He's got a lot of tricky moves, so don't be caught off your guard! We'll wait until he's off his guard, and then we'll take him and his company for all they're worth!

Common Names:

Name	Pronounced	Usage
Faizel	-	Arabic
Takhma Urupi	-	Persian Mythology
Arto	AHR-to	Finnish
Claude	KLOD (French), KLAWD (English)	French, English
Slobodan	-	Serbian, Macedonian, Croatian
Graciana	grah-THYAH-nah (Spanish), grah-SYAH-nah (Latin American Spanish), grə-SYA-nə (Portuguese)	Spanish, Portuguese