Inspiration where it's due.
Rules (for me):
1. No looking for them intentionally.
2. If another person brings one up for me, the person must not know I am searching for them.
Belie-to expose or to lie (His face belied his true attitude.)
Cleave-to separate or to join (She cleaved the item(s).)
Dust-to add dust (crops) or remove it (dusting)
Nonplussed-surprised or unaffected (granted, this one is informal, but still requires context around phrases like, "The situation left her nonplussed.")
Overlook-to watch carefully (overseer) or to miss entirely (The leader overlooked the rebellion.)
Reciprocal-corresponding/matching or inverse