* Stroll: This implies a leisurely and confident walk.
* Strut: This suggests a confident and proud gait.
* March: This implies a purposeful and direct movement.
* Charge: This suggests a forceful and aggressive advance.
* Direct: This implies a straightforward and open approach.
For example:
* Instead of sidling into the room, she strode in confidently.
* He didn't sidle up to the microphone, he charged towards it with a grin.
* Instead of sidling away from the argument, she faced it head-on.
The best antonym will depend on the specific situation and the intended meaning.