1. Underneath means in a lower position than something else.
The sheets are underneath the blankets on the shelf.
2. Underneath means covered by.
I found my jacket underneath the other coats.
3. Underneath indicates concealed feelings.
Underneath her smile there is a lot of heartache.
He is really very kind underneath his stern appearance.
Fact
An ice cream headache occurs when the coldness of the ice cream comes in contact with a spider-shaped web of nerves on the roof of the mouth. When the temperature of these nerves cools down, the brain believes that it's about to freeze and unnecessarily sends warm blood to the area. Instead of warming the area, it causes a headache.
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