When to seek medical advice. 1  You experience bleeding or severe pain after an injury. 2  Bone or tendons are exposed. 3  The knee is visibly out of place. 4  There's sudden swelling or redness.  You can't bend your knee or put weight on it.
subject definition, subject meaning | English dictionary. subject. a the predominant theme or topic, as of a book, discussion, etc. 4 a person or thing that undergoes experiment, analysis, treatment, etc. 5 a person who lives under the rule of a monarch, government, etc.
Definition of subject for Students. 1  1 : the person or thing discussed : topic She's the subject of rumors. Let's change the subject. 2  2 : an area of knowledge that is studied in school Geography is my favorite subject. 3  3 : a person who owes loyalty to a monarch or state.  4 : a person under the authority or control of another.