verb
to fall
B1
Stürzen: means 'to fall' (to topple/ plunge). A regular (weak) verb using sein as auxiliary (Perfekt: ist gestürzt) because it denotes movement/change of state. Not reflexive, not separable. Partizip II: gestürzt. Can be used intransitively; transitively it may mean 'to overthrow'.
Examples
Sie ist vom Pferd gestürzt.
She fell off the horse.
Er stürzte die Treppe hinunter.
He fell down the stairs.
Der Radfahrer ist gestern auf nasser Straße gestürzt.
The cyclist fell on the wet road yesterday.
Details
Mnemonics
Imagine someone tripping and tumbling down stairs — the dramatic 'sturz' moment.
Sounds like 'sturz' (English 'sturz' ~ 'sturz' reminds of 'stir' falling over) — think fall.
Notes
Commonly used for accidental falls (person, object). In contexts of overthrowing or toppling (a government) it can be used transitively or figuratively. (When used transitively, passive forms are possible; when used as an intransitive motion 'to fall', the action does not take a direct object.)