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
Table tennis balls have been known to travel off a paddle at speeds up to 160 km/hr (approx. 100mph).
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