The word "CASWIG" is not found in any dictionary, therefore its spelling can only be speculated. Based on the IPA phonetic transcription, "CASWIG" may be spelled as /kæswɪɡ/. This indicates that the word contains a short "a" sound followed by the consonant cluster "sw" and ends with the vowel "i" and the consonant "g". Without context, it is impossible to determine the meaning of this word or its origin.