I. ˈsla-thər noun
Etymology: origin unknown
Date: 1843
: a great quantity — often used in plural
II. transitive verb
( slath·ered ; slath·er·ing ˈsla-thə-riŋ, ˈslath-riŋ)
Date: 1866
1. : to use or spend in a wasteful or lavish manner : squander
2.
a. : to spread thickly or lavishly
slather ed sunscreen on her skin
b. : to spread something thickly or lavishly on
slather ed her skin with sunscreen