With arms akimbo is an idiom that refers to standing with one's hands on their hips and elbows pointed outwards. If you're looking for synonyms to describe this confident, assertive stance, you could try using phrases like hands on hips, elbows out, or posed confidently. Alternatively, you could use more descriptive language to paint a more vivid picture, such as standing tall with a wide stance, or exuding strength with a no-nonsense posture. Whatever wording you choose, the goal should be to convey a sense of power and self-assurance that comes from standing tall and confident.