IPA: /ˈfɔːnər/
KK: /ˈfɔːnər/
A person who flatters or praises someone excessively, often to gain favor or advantage.
The fawner always complimented the boss to get a promotion.
Fawner is derived from the verb 'fawn' (from Old English 'fagnian', meaning to rejoice or to show affection) combined with the suffix '-er' (meaning a person who). A fawner is a person who shows excessive affection or flattery, often to gain favor.
Think of someone who 'shows affection' ('fagnian') to gain favor — that's why a fawner is someone who flatters excessively.