I. las ‧ so 1 /ləˈsuː, ˈlæsəʊ $ -soʊ/ BrE AmE noun ( plural lassos or lassoes ) [countable]
[ Date: 1700-1800 ; Language: Spanish ; Origin: Latin laqueus ; ⇨ ↑ lace 1 ]
a rope with one end tied in a circle, used to catch cattle and horses, especially in the western US
II. lasso 2 BrE AmE verb [transitive]
to catch an animal using a lasso