I .
/ ˈslævə(r); NAmE / verb
[ v ] ( usually of an animal ) to let saliva (= the liquid produced in the mouth) run out of the mouth, especially when hungry or excited :
slavering dogs
II .
/ ˈsleɪvə(r); NAmE / noun
1.
(in the past) a person who bought and sold slaves
2.
a ship that was used in the past for carrying slaves
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WORD ORIGIN
I . Middle English : probably from Low German ; compare with slobber .