Idiom of the day :- Catch someone red-handed

Usage, examples and definition of the Idiom :-

‘Ah ha, so you’re the one who has been painting pictures on my blackboard !’ Professor Michael exclaimed. ‘At last I have caught you red-handed !’ To catch someone red-handed is to discover him or her in the process of committing a naughty or forbidden act. ‘I’m sorry, I thought a little color would help to brighten up our classroom,’ Danny pleaded.