If someone’s getting long in the tooth, it means they’re getting old, or too old for their behavior. The metaphor of long teeth comes from horses. If you look at a horse’s teeth and the extent to which their gums have receded, you...
horse tooth floater n.— «Doc Ellers was very pleased, as he presented me with a set of old horse teeth floaters. He told me they worked much better than the new contraptions. He was eighty.» —by Re`al “Buill” Oney My...