intransitive verb
Definition: To make a strong effort or to be under pressure; to struggle or exert oneself.
Example: She strained to lift the heavy box off the ground.
noun
Definition: A type or variety of something, often used to describe a specific kind of quality, injury, or breed.
Example: The scientist discovered a new strain of bacteria that could resist antibiotics.
transitive verb
Definition: To apply force to something in a way that changes its shape or condition, often causing damage or injury.
Example: He strained his back while lifting a heavy box.