Is it ensure, insure, or assure?
1550s, "one who chokes," agent noun from choke (v.). From 1848 as "large neckerchief;" as a kind of necklace, 1928.
in jewelry, necklace that fits closely around the neck like a snug, high collar. The choker became popular in the late 19th century, and its popularity has continued through the 20th