He could have hidden one under his tongue, maybe, but six?

Her skin broke into a burning flush under his tongue.

She felt some fear, and it tasted like a penny under her tongue.

The thought of food brought the juices up under my tongue.

One of those she held to dissolve under her tongue.

Instead, she only succeeded in getting the hair lodged under her tongue.

He took out the pills again, let one melt under his tongue.

You may also feel a burning sensation under your tongue.

You just keep that under your tongue until I get back.

Someone had asked me to keep a thermometer under my tongue.