Pronunciation: [snˈiːk ˌʌp ˈɒn] (IPA) 
The phrase "sneak up on" is spelled with the IPA phonetic symbols /snik/ for "sneak" and /ʌp ɒn/ for "up on." The "s" in sneak is pronounced with a soft "s" sound, followed by a "k" sound. The "ea" is pronounced with a long "e" sound, and the "k" at the end is silent. "Up on" is pronounced with a short "u" sound in "up" and a short "o" sound in "on." The phrase means to approach someone quietly or without being noticed.
The phrase "sneak up on" is an idiomatic expression that means to approach someone or something quietly and unexpectedly, typically in order to surprise or catch them off guard. It is often used to describe a stealthy and furtive act, where the person or object being approached is unaware of the presence or intentions of the individual doing the sneaking.
This phrase is commonly used in situations where one person wants to approach someone else without being noticed. For example, a child might sneak up on their friend during a game of hide-and-seek, where they try to get close without being heard or seen before making their presence known. Similarly, a person might sneak up on a coworker in the office, intending to play a playful prank or startle them for entertainment.
"Sneak up on" can also be used metaphorically to describe a gradual or unexpected progression, particularly in relation to events or situations. For instance, a sudden change in weather patterns might sneak up on people, catching them unprepared. Alternatively, an opportunity or problem may sneak up on someone, surprising them with its sudden arrival or significance.
In essence, to "sneak up on" implies approaching someone or something quietly and discreetly, often with the intention of surprising or catching them unaware. It can also denote a gradual or unexpected development that takes someone by surprise.
