The spelling of the phrase "gave brush" can be explained using the International Phonetic Alphabet (IPA) transcription. The first word, "gave", is spelled with the vowel sound /eɪ/ as in "bay" and the consonant sounds /ɡ/ and /v/. The second word, "brush", is spelled with the vowel sound /ʌ/ as in "cup" and the consonant sounds /b/, /r/, /ʌ/, and /ʃ/ as in "shush". Overall, "gave brush" is spelled using a combination of vowels and consonants that create a distinct sound when pronounced correctly.