pick up on

1. Become aware of, notice, as in The teacher picked up on her nervousness right away. [Colloquial; mid-1900s]

Related Words

• catch 
• come upon 
• design 
• detect 
• determine 
• devise 
• disclose 
• explore 
• hear 
• identify 
• invent 
• learn 
• locate 
• notice 
• observe 
• realize 
• recognize 
• reveal 
• see 
• spot