Merriam-Webster's Dictionary and Thesaurus - Merriam-Webster [417]
1 : toward or in a lower physical position
2 : to a lying or sitting position
3 : toward or to the ground, floor, or bottom
4 : as a down payment 5 : on paper 6 : in a direction that is the opposite of up 7 : SOUTH 8 : to or in a lower or worse condition or status 9 : from a past time 10 : to or in a state of less activity 11 : into defeat Synonyms below, downward, over; also facedown; low; downgrade, downhill, downstairs Antonyms up, upward, upwardly 2down preposition : down in, on, along, or through : toward the bottom of 3down verb 1 : to go or cause to go or come down 2 : DEFEAT 3 : to cause (a football) to be out of play Synonyms bowl, drop, fell, floor, knock, level 4down adjective 1 : occupying a low position; especially : lying on the ground 2 : directed or going downward 3 : being in a state of reduced or low activity 4 : low in spirits : DEJECTED 5 : affected with disease or ill health : SICK <~ with a cold> 6 : arrived at or brought to an end : DONE 7 : completely mastered 8 : being on record Synonyms [2] downcast, downward—more at DOWNCAST [5] bad, ill, indisposed, peaked, punk, sick, unhealthy, unsound, unwell—more at SICK 5down noun 1 : a low or falling period (as in activity, emotional life, or fortunes) 2 : one of a series of attempts to advance a football 3 : an instance of putting down 4 : a quark with a charge of -1/3 that is one of the constituents of the proton and neutron Synonyms comedown, decline, descent, downfall, fall—more at COMEDOWN 6down noun : a rolling usu. treeless upland with sparse soil — usu. used in pl. Synonyms grassland, plain, prairie, savanna, steppe, veld—more at PLAIN 7down noun 1 : a covering of soft fluffy feathers; also : such feathers 2 : a downlike covering or material Synonyms floss, fluff, fur, fuzz, lint, nap, pile—more at FUZZ down·beat noun : the downward stroke of a conductor indicating the principally accented note of a measure of music down·burst noun : a powerful downdraft usu. associated with a thunderstorm that is a hazard for low-flying aircraft; also : MICROBURST down·cast adjective 1 : low in spirit : DEJECTED 2 : directed down Synonyms down, downward down·draft noun : a downward current of gas (as air) down·er noun 1 : a depressant drug; especially : BARBITURATE 2 : someone or something depressing down·fall noun 1 : a sudden fall (as from high rank) 2 : something that causes a downfall — down·fall·en adjective Synonyms comedown, decline, descent, down, fall—more at COMEDOWN 1downgrade noun 1 : a downward slope (as of a road) 2 : a decline toward a worse condition Synonyms decadence, declension, decline, degeneracy, degeneration, degradation, descent, deterioration, downfall, fall—more at DECLINE 2downgrade verb : to lower in quality, value, extent, or status Synonyms break, bust, degrade, demote, reduce—more at DEMOTE down·heart·ed adjective : low in spirit : DEJECTED 1downhill adverb : toward the bottom of a hill — downhill adjective 2downhill noun : the sport of skiing downhill usu. in a race against time 1download noun : an act or instance of downloading something; also : the item downloaded 2download verb : to transfer (data) from a computer to another device — down·load·able adjective down payment noun : a part of the full price paid at the time of purchase or delivery with the balance to be paid later down·play verb : DE-EMPHASIZE <~ed the allegations> down·pour noun : a heavy rain Synonyms cloudburst, deluge, rain, rainstorm, storm, wet—more at RAIN down·range adverb : away from a launching site 1downright adverb : THOROUGHLY 2downright adjective 1 : being completely or exactly what is stated : ABSOLUTE 2 : abrupt in speech or manner : BLUNT down·shift verb : to shift an automotive vehicle into a lower gear down