puzzle
nounADJ.
great | perplexing | scientific, theoretical
VERB + PUZZLE
solve | remain
What happened to the ship remains a puzzle.PUZZLE + VERB
remain
The puzzle remains of what happened to the ship.PREP.
in a/the ~
They knew who the killer was, but there were still some gaps in the puzzle.| ~ about
There is a puzzle about how the plant first came to Britain.| ~ of
They're trying to solve the puzzle of how gravity works.PHRASES
a bit/piece of the puzzle
Another piece of the puzzle fell into place.| the key to a puzzle
Traces of explosives found among the wreckage were the key to the puzzle.| a piece in the puzzle
The police didn't know what the message meant, but it was another piece in the puzzle.| a solution to a puzzle, something of a puzzle
The origin of the word is something of a puzzle.ADJ.
crossword, jigsaw | number, picture, word | complicated
VERB + PUZZLE
do, solve
PUZZLE + NOUN
book