spell something ↔ out phrasal verb ( see also ↑ spell )
1 . to explain something clearly and in detail
spell out how/what etc
The report spelled out in detail what the implications were for teacher training.
2 . to show how a word is spelled by writing or saying the letters separately in order:
‘W-E-I-R,’ she said, spelling it out.
3 . to write a word in its complete form instead of using an ↑ abbreviation