[jig.saw] n (1873) 1: a machine saw with a narrow vertically reciprocating blade for cutting curved and irregular lines or ornamental patterns in openwork
2: scroll saw 1
3: jigsaw puzzle
[2]jigsaw vt (1873) 1: to cut or form by or as if by a jigsaw
2: to arrange or place in an intricate or interlocking way [3]jigsaw adj (1884): suggesting a jigsaw puzzle or its separate pieces