put one on guard

put one on one's guard

to make one wary or cautious. The menacing growl by the watchdog put me on my guard. Every time the boss comes around, it puts me on my guard.

Name	Pronounced	Usage
Aranrhod	-	Welsh, Welsh Mythology
Duana	-	English (Rare)
Sophia	so-FEE-ə (English), so-FIE-ə (British English), zo-FEE-ah (German)	English, Greek, German, Ancient Greek
Marjorie	MAHR-jə-ree	English
Morgan	['mɔ:gən]
Keshet	-	Hebrew