never, never at all (referring to an indefinite period of time) / never, not once (referring to a defined period of time; see usage notes below)

unprecedented; hitherto unseen

better late than never

(idiomatic) One must experience something to understand it properly. (But sometimes used without context merely for comedic effect.)

low / mean / menial

down

a prefix; equivalent to down-(?)

a surname

first/third-person singular preterite of niederschlagen

second-person singular preterite of niederschlagen