put on one's thinking cap

Think or reflect seriously, as in A new slogan? I'll have to put on my thinking cap for that. This term originated in the late 1800s and replaced considering cap, which dates from the early 1600s.

Common Names:

Name	Pronounced	Usage
Dian	DEE-ahn	Indonesian
Nicole	[ni'kəul]
Aglaya	-	Russian
Carlisa	kar-LEE-sə	English (Rare)
Mnason	-	Biblical, Biblical Latin, Biblical Greek, Ancient Greek
Soini	SOY-nee	Finnish