I. ˈdau̇nə(r) noun
( -s )
Etymology: down (VI) & down (IV) + -er
: one that downs or that takes, brings, gets, or puts down ; especially : a weak, sick, or crippled animal in a shipping load that is down and unable to rise
II. noun
1. : a depressant drug ; especially : barbiturate — compare upper herein
2. : someone or something depressing, disagreeable, or unsatisfactory