The antonyms for the phrase "shaking on" include words such as steady, secure, stable, firm, and unwavering. These words depict a sense of confidence and groundedness, as opposed to the unstable and uncertain connotations of shaking. When we say someone is "shaking on" something, it implies a lack of conviction or belief in what they are saying or doing. Antonyms such as steady and secure create a sense of reliability and dependability, which can be reassuring in uncertain times. These antonyms also imply a sense of control, as opposed to the loss of control associated with shaking.