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congest (v.)

early 15c. (implied in congested), of body fluids, "to accumulate," from Latin congestus, past participle of congerere "to bring together, pile up," from assimilated form of com "with, together" (see con-) + gerere "to carry, perform" (see gest). Sense of "overcrowd" is from 1859. Related: Congested; congesting.