The correct spelling of the phrase "getting feet" can be determined through the use of the International Phonetic Alphabet (IPA). The first sound is the voiced velar stop /ɡ/, followed by the central vowel sound /ɛ/. The second syllable begins with the voiced dental fricative /ð/ and then the front open-mid vowel sound /ɛ/. The final syllable starts with the voiceless labiodental fricative /f/ followed by the voiceless dental fricative /θ/. Therefore, the correct spelling of the phrase is "getting feet."