The spelling "dropt a kite" is a slightly archaic version of "dropped a kite". The word "dropt" is written with a final "-t" instead of the modern spelling "dropped". This is because, historically, the past tense of the verb "drop" was formed by adding a "-t" to the end of the word. In the IPA phonetic transcription, "dropt" is pronounced as /drɑpt/ with a final voiceless /t/ sound. Overall, the phrase "dropt a kite" means that someone released a kite from their hands or let it go.