不得其死

bùdéqísǐ
  1. (colloquial) to die suddenly for no reason at all
  2. to die suddenly for no reason at all

Wiktionary

Entry Composition

=1 不得 bùdé
  1. must not
  2. may not
  3. not to be allowed
  4. cannot
=1 不得 bude complement placed after a verb to express impossibility or inability; cannot; be unable to
=2 其 qí
  1. his
  2. her
  3. its
  4. their
  5. that
  6. such
  7. it (refers to sth preceding it)
=2 其 jī
  1. (obsolete) Used at the end of a sentence to show doubt.
  2. (obsolete) Used in personal names.
  3. Used at the end of a sentence to show doubt.
  4. Used in personal names.
=2 其 jì
  1. (archaic) only used in 彼其
  2. only used in 彼其
3 死 sǐ
  1. to die
  2. impassable
  3. uncrossable
  4. inflexible
  5. rigid
  6. extremely
  7. damned