taphint
nounUK /ˈtæphɪnt/
US /ˈtæphɪnt/
A taphint is a small clue you get by tapping something.
She gave the door a quick taphint so I knew which one to open.
OTHER MEANINGS
2. A soft tapping sound used to get someone's attention.
He made a taphint on the glass to call the waiter.
3. A tiny piece of advice given with a light touch.
Grandma's taphint on my shoulder told me to be patient.
4. A hidden message sent by a pattern of taps.
The prisoner used a taphint on the pipe to talk to the next cell.