"immobilize" is a correct and usable word in written English.
You can use it to describe making something immovable or keeping something from moving or acting. For example, "The storm immobilized the entire town, leaving them without power for days."
A frontal attack would immobilize the enemy while forces on the flanks would execute a double envelopment, forming a pocket called a Kessel ("cauldron") around the enemy.
Working the range alone, a hand often had to catch and immobilize an animal weighing 400 to 600 pounds (about 180 to 270 kg) by himself.
Much larger amounts of water are mechanically immobilized between the elongated peptide chains of fibrous proteins; for example, one gram of gelatin can immobilize at room temperature 25 to 30 grams of water.
The anemone's tentacles, which contain numerous nematocysts (or stinging cells) that are used to immobilize the anemone's prey, protect the common clown fish from its predators.
Humus, either as a separate solid phase or as a coating on mineral surfaces, can immobilize these compounds and, in some instances, detoxify them significantly.
Team roping, timed rodeo event in which two mounted contestants attempt to rope and immobilize a full-grown steer.
Some male spiders use their specialized jaws or legs to hold and immobilize the jaws of the female during mating.
Gaucho weapons were the lasso, knife, and boleadoras (or bolas), a device made of leather cords and three iron balls or stones that was thrown at the legs of an animal to entwine and immobilize it.
Some snakes (e.g., rattlesnakes) use venom to immobilize their prey, and many spiders wrap their victims in thread.
Mistrustful of promises that the French ships would be used only for "supervision and minesweeping," the British decided to immobilize them.
