/ ˈdʒɪgsɔː; NAmE / noun
1.
(also ˈjigsaw puzzle ) (both BrE ) (also puz·zle NAmE , BrE ) a picture printed on cardboard or wood, that has been cut up into a lot of small pieces of different shapes that you have to fit together again :
to do a jigsaw
2.
a mysterious situation in which it is not easy to understand all the causes of what is happening; a complicated problem
3.
a saw (= a type of tool) with a fine blade for cutting designs in thin pieces of wood or metal
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WORD ORIGIN
late 19th cent.: from the verb jig + the noun saw .