shifting spanner

16 LETTERS · STARTS WITH S

shifting spanner is a valid 16-letter word worth 24 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1H4I1F4T1I1N1G2S1P3A1N1N1E1R1

1 + 4 + 1 + 4 + 1 + 1 + 1 + 2 + 0 + 1 + 3 + 1 + 1 + 1 + 1 + 1 =24 PTS

DOUBLE WORD → 48TRIPLE WORD → 72

MEANING

What does shifting spanner mean?