Meaning of “spell” - Learner’s Dictionary

spell

verb uk us /spel/ (past tense and past participle spelled, also UK spelt)
WORDS [ T ]

A2 to write down or tell someone the letters that are used to make a word:

How do you spell that?
Her name's spelt S-I-A-N.
ABILITY [ I ]

If you can spell, you know how to write the words of a language correctly:

My grammar's all right, but I can't spell.
spell disaster/trouble, etc

If something spells disaster, trouble, etc, you think it will cause something bad to happen in the future:

The new regulations could spell disaster for small businesses.

(Definition of “spell verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)