Pronunciation: [dɹˈɒpt ɪn ˈɒn] (IPA) 
The spelling of the phrase "dropt in on" is unconventional as it uses archaic English spelling. The correct modern spelling is "dropped in on," but in this case, the letter "e" is omitted from the word "dropped" while the letter "t" is added to indicate the past tense. The sound of the word "dropt" is transcribed in IPA as /drɒpt/, with the "o" pronounced as in "hot" and the "p" being a voiceless bilabial plosive.
The phrasal verb "dropt in on" is a colloquial expression that refers to the act of making an unplanned or spontaneous visit to someone, typically without prior arrangement. It is used to describe a situation when an individual unexpectedly shows up at another person's location, be it a house, workplace, or any other setting. This phrase implies an informal visit, often for a short duration and without a specific purpose or agenda.
"Dropt in on" conveys the sense of an impromptu encounter, suggesting that the individual arrived unannounced and without advance notice. The expression implies a casual, friendly, or pop-in visit, where the intention is to catch up, check-in, or simply spend time with someone. This phrase is commonly used in a social context, especially between friends, acquaintances, or relatives who have an established level of familiarity or close relationship.
The use of the word "dropt" instead of "dropped" adds a touch of informality and highlights the colloquial nature of the expression. Overall, "dropt in on" concisely captures the concept of an unexpected visit, with the emphasis on spontaneity, informality, and a casual social interaction.
