укрепи́ть

uncommon #7909

verbperfective imperfective is укрепля́ть

1.
to strengthen, to fortify, to reinforce, to consolidate
Спорт укрепи́т твоё здоро́вье.
Sport will strengthen your health.
Of abstract things: health, nerves, discipline, a position, a currency.
2.
to fasten, to fix firmly, to secure
Он укрепи́л полку на стене.
He fixed the shelf to the wall.
3.
to fortifymilitary
Солда́ты укрепи́ли бе́рег реки́.
The soldiers fortified the river bank.

Examples

Садовник укрепил дерево новой подпоркой.
The gardener reinforced the tree with a new support.
Сгибание руки в локте помогает укрепить мышцы.
Bending the arm at the elbow helps strengthen the muscles.
Мастер укрепил брам-стеньгу перед плаванием.
The shipwright secured the topgallant mast before the voyage.
Здесь склон, размываемый дождями, укрепили камнями.
Here, they reinforced the slope, which was being eroded by the rain, with stones.
Крепильщик укрепил стены шахты досками.
The timberer reinforced the mine walls with boards.
Инженеры укрепили оседавший фундамент школы.
The engineers reinforced the foundation of the school, which was sinking.
Рабочие укрепили кренившийся столб у дороги.
The workers reinforced the leaning post by the roadside.
Эти переговоры укрепили взаимодоверие сторон.
These negotiations strengthened mutual trust between the parties.

Note: Stress change.

Imperative
ты	укрепи́
вы	укрепи́те

Active present	-
Active past	укрепи́вший	having strengthened, that has strengthened, who has strengthened
Passive present	-
Passive past	укреплённый	reinforced, fortified, strengthened
Gerund present	-
Gerund past	укрепи́в укрепивши укрепя́	while doing (past)