promptreason

noun
UK /ˈprɒmptˌriːzən/
US /ˈprɑːmptˌriːzən/

A promptreason is a quick and clear reason you give to explain why you did something.

When the teacher asked why he was late, he gave a promptreason about the broken bus.


OTHER MEANINGS

2. A reason that comes to mind right away without much thinking.

Her promptreason for choosing the blue dress was that it matched her shoes.

3. A reminder or cue that helps someone remember the cause of something.

The note on the fridge was a promptreason to buy more milk.

4. A fast, helpful answer that tells why a rule or action exists.

The coach gave a promptreason for the new warm-up routine so everyone understood.