to drop something / to remove/take off / (impolite) to make a woman one's girlfriend / (Internet slang) to download / (informal) to fail an examination

落とす: to drop something

love child / some undesirable product, child, or consequence; the aftermath

to become disheartened

to die (from accidents or disease)

to let one's voice become quieter

to fail to hear something; to miss

to beat down, to knock off