(1):

(v. t.) To press back or down effectually; to crush down or out; to quell; to subdue; to supress; as, to repress sedition or rebellion; to repress the first risings of discontent.

(2):

(v. t.) To press again.

(3):

(v. t.) Hence, to check; to restrain; to keep back.

(4):

(n.) The act of repressing.