The phrase "upsetting the apple cart" means to cause disruption or chaos. Antonyms of this phrase include words such as "maintaining order," "spreading harmony," and "keeping peace." These antonyms suggest the opposite of upsetting the apple cart, where one seeks to keep things under control, to promote feelings of comfort and stability, and to prevent any disturbance from occurring. Rather than disturbing the norm, these antonyms signify a desire to maintain the current state without causing any upset or turmoil. Thus, the antonyms of upsetting the apple cart indicate the opposite of creating unrest and instead signal a desire for stability and peacefulness.