-in-waiting

Definitions

1. Depending on the expected arrival of a result, confirmation, etc.
   morpheme
2. About to happen; bound to happen.
   morpheme
3. Attendant to a royal figure.
   morpheme

Examples

“Throughout her adolescence, authorities... commented that the young mother-in-waiting 'seem[ed] to have⟳ very, very high expectations of [her]self,' and... there was no failing to discern in them that slight unmistakable note⟳ of approval... and at any rate the future mother felt (for the moment) approved.”

“Choosing such an unqualified person to operate⟳ the machine is an accident-in-waiting.”

CEFR level