congest (v.) Look up congest at Dictionary.com
early 15c., "to bring together" (transitive), from Latin congestus, past participle of congerere "to bring together, pile up," from com "with, together" (see com-) + gerere "to carry, perform" (see gest). Medical sense of "unnatural accumulation" (1758) led to transferred (intransitive) sense of "overcrowd" (1859). Related: Congested; congesting.