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span-dog
span-dog n. 
/ˈspænˌdɑɡ/
Brit. /ˈspandɒɡ/
, /ˈspandɒɡ/U.S. /ˈspænˌdɔɡ/
, /ˈspænˌdɔɡ//ˈspænˌdɑɡ/ΚΠ
1867 W. H. Smyth & E. Belcher Sailor's Word-bk. 255 Span-dogs. Used to lift timber. A pair of dogs linked together, and being hooked at an extended angle, press home with greater strain.
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