WordNet sense 1 (move something or somebody to a lower position):

lower, lower, bring down, take down

WordNet sense 2 (get off (a horse)):

dismount, light, unhorse, get off

WordNet sense 3 (lower someone's spirits; make downhearted):

deject, demoralize, depress, dismay, dispirit, demoralise, cast down

WordNet sense 4 (pass through the esophagus as part of eating or drinking):

swallow

WordNet sense 5 (put down in writing; of texts, musical compositions, etc.):

write down, set down, put down

WordNet sense 6 (take the first step or steps in carrying out an action):

begin, get, start, commence, set about, set out, start out