Riddle

Mouth up it gets filled, mouth down it gets empty.

Choose an answer

A.Jug
B.Funnel
C.Cup
D.Bottle
Hint: It's a word with 6 letters, starting with "B".

Answer

Bottle

Why this is the answer

Turning a bottle's mouth upward lets it be filled with liquid, while turning it mouth-down empties it out.

This riddle is filed under Hard/Difficult Riddles and rated Medium.