fall

How to sign: the season when the leaves fall from the trees
"in the fall of 1973";

Similiar / Same: autumn

Categories: season, time of year

fall

How to sign: decrease in size, extent, or range
"The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fall to under a hundred pounds"; "his voice fell to a whisper";

Similiar / Same: decrease, diminish, lessen

Categories: change magnitude

Within this category: abate, boil down, break, break, de-escalate, decelerate, decline, decrescendo, deflate, depreciate, drop off, dwindle, ease up, remit, shorten, shrink, shrink, shrivel, taper, thin out, vanish, wane, wane, weaken

fall

How to sign: move downward and lower, but not necessarily all the way
"The temperature is going down"; "The barometer is falling"; "The curtain fell on the diva"; "Her hand went up and then fell again";

See also: cave in, collapse, fall in, give way, founder, give, break

Similiar / Same: descend, go down, come down

Categories: go, locomote, move, travel

Within this category: alight, avalanche, cascade, crash, decline, dive, drip, drop, flop, pitch, plop, pounce, precipitate, prolapse, rappel, set, sink, sink, tumble, unhorse

fall

How to sign: the time of day immediately following sunset
"he loved the twilight"; "they finished before the fall of night";

Similiar / Same: twilight, dusk, gloaming, nightfall, evenfall, crepuscule, crepuscle

Categories: hour, time of day

Within this category: night

fall

How to sign: lose an upright position suddenly
"The vase fell over and the water spilled onto the table"; "Her hair fell across her forehead";

Similiar / Same: fall down

Categories: change posture