/ ʃæg; NAmE / noun , verb , adjective
■ noun
1.
[ U ] a strong type of tobacco cut into long thin pieces
2.
[ C ] a large black bird with a long neck that lives near the sea
3.
[ C , usually sing. ] ( BrE , taboo , slang ) an act of sex with sb
■ verb
( -gg- ) [ v , vn ] ( BrE , taboo , slang ) to have sex with sb
■ adjective
[ only before noun ] used to describe a carpet, etc., usually made of wool, that has long threads
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WORD ORIGIN
adjective and noun sense 1 late Old English sceacga rough matted hair , of Germanic origin; related to Old Norse skegg beard.
noun sense 2 mid 16th cent.: perhaps a use of the adjective shag , with reference to the bird's “shaggy” crest.
noun sense 3 and verb late 18th cent.: of unknown origin.