(~s)
1.
If something ~s you, you do not understand it and feel confused.
My sister ~s me and causes me anxiety.
VERB: V n
puzzling
His letter poses a number of puzzling questions.
ADJ
2.
If you ~ over something, you try hard to think of the answer to it or the explanation for it.
In rehearsing Shakespeare, I ~ over the complexities of his verse and prose.
VERB: V over / about n
3.
A ~ is a question, game, or toy which you have to think about carefully in order to answer it correctly or put it together properly.
...a word ~.
N-COUNT: oft supp N
see also crossword
4.
You can describe a person or thing that is hard to understand as a ~.
Data from Voyager II has presented astronomers with a ~ about why our outermost planet exists...
= mystery
N-SING: a N