sharp as a tack

(adjective) very smart

Example Sentences:

A: How is your son doing in school?
B: Great! He is getting great marks! He is sharp as a tack! How is your son?
A: Terrible! I am jealous!

My new dog is as sharp as a tack. She knows how to sit, stay, beg and bark all night.

From the Blogs:

Hope Stamps Eternal: Elzybells Release and Sharp as a Tack

Media:

Similar idioms:

1. smart cookie
2. hope springs eternal
3. sharp
4. have a ball
5. have a blast