The phrase "upsets one apple cart" means to cause disruption or chaos in a situation. One possible origin of this phrase is that in the past, street vendors would sell apples from a cart. If someone were to accidentally upset the cart, all of the apples would fall to the ground and the vendor's business would be disrupted. The spelling of "upsets" is /ʌpˈsɛts/ and "apple" is /ˈæpəl/, while "cart" is pronounced /kɑrt/.
The phrase "upsets one apple cart" is an idiomatic expression that has its origins in an agricultural context. Its dictionary definition denotes an action or event that disrupts or disturbs a harmonious or stable situation. The phrase finds its roots in the traditional method of transporting apples in a cart. Apple cart vendors would carefully arrange the apples to maintain stability and prevent them from falling off the cart during transit.
Metaphorically, "upsets one apple cart" refers to an action or event that creates discord, chaos, or disturbance in a situation or a group's equilibrium. It suggests the disruption of a smoothly functioning system or the interference with the intended course of events. Consequently, it may introduce unpredictability, inconvenience, or complications, leading to a state of disarray or inconvenience.
The expression also implies the disturbance caused by an individual challenging established norms, beliefs, or practices. By upending the proverbial apple cart, an individual or action may challenge the status quo, disrupt established routines, or challenge the conventional wisdom, inviting debate and potentially driving change.
Overall, the phrase "upsets one apple cart" conveys the imagery of upending the order, contradicting expectations, disrupting harmony, and generating some degree of disorder or change within a situation, system, or group.