The phrase "allowed to fortify" is correct and usable in written English.
It can be used in contexts where permission is granted to strengthen or enhance something, such as a position, argument, or structure.
Example: "The team was allowed to fortify their defenses before the final match."
Alternatives: "permitted to strengthen" or "authorized to enhance".
Many Colombians had concluded that the rebels were using the peace effort to stall, allowing them to fortify their 17,000-member army.
Some people in remote communities note, darkly, that a ruinous storm would at least be followed by federal dollars that would allow them to fortify or move.
Packaged in single serving sachets, it allows families to fortify food for their young child with the safe and appropriate level of vitamins and minerals important for their growth and development.
Mayor Jim Suttle of Omaha, however, was confident that a local levee system that reaches well above the highest predicted levels would keep the city dry, particularly given the advance notice that has allowed workers time to fortify the wastewater treatment plant.
In brief, an aliquot of 10 mL of each serum sample was fortified with 13C-labelled β-HCH and allowed to rest overnight.
The imperial navy was allowed to fall into disrepair while forced labor constructed the Liaodong palisade and connected and fortified the Great Wall of China into its modern form.
When the French king re-entered the city, his enemies in Paris fortified themselves in the Bastille; after a siege, they eventually ran out of food, surrendered and were allowed to leave the city after the payment of a ransom.
No alcohol is allowed in the arena, and she was operating a small shebeen to allow the thirsty to fortify themselves.
Briefly, DNA samples (100 200 μg) were fortified with the internal standard O-CD3-dG (6 pmol) and hydrolyzed in 0.1 N HCl at 80 °C for 90 min. The samples were allowed to cool, neutralized with NH4OH, and analyzed using LC-MS.
