If "abridge" means to shorten or condense:
* Expand: This is the most direct antonym, meaning to make something longer or more detailed.
* Elongate: Similar to expand, this implies making something longer.
* Enlarge: This implies making something larger in scope or detail.
* Amplify: This suggests adding to something to make it more complete or thorough.
If "abridge" means to reduce or curtail:
* Extend: This means to make something longer or more extensive.
* Prolong: This suggests making something last longer.
* Augment: This means to increase or enlarge something.
If "abridge" means to violate or restrict:
* Respect: This means to treat something with due consideration or regard.
* Uphold: This suggests supporting or maintaining something.
* Honor: This implies treating something with reverence or esteem.
The best antonym will depend on the specific meaning of "abridge" in your context.