Back and Forth by Sign Baby Sign | May 12, 2015 Share This Tweet Share Merriam-Webster Online Dictionaryback and forth (adverb) backward and forward , also between two places or persons Merriam-Webster Online ThesaurusRelated Articles: 11 Exciting Easter Activities in the Classroom: Crazy Fun Every Day!15 Sign Language Advantages & Classroom Strategies for Students with Autism Spectrum DisorderTeach your baby to sign “apple”