1.  fall in(v = verb.motion) break, cave in, collapse, founder, give, give way - break down, literally or metaphorically; "The wall collapsed"; "The business collapsed"; "The dam broke"; "The roof collapsed"; "The wall gave in"; "The roof finally gave under the weight of the ice"
is one way to change
Sample sentences: Something ----s; Somebody ----s

2.  fall in(v = verb.social) Array - to take one's place in a military formation or line; "Troops fall in!"
Sample sentences: Somebody ----s

3.  fall in(v = verb.social) get together, join - become part of; become a member of a group or organization; "He joined the Communist Party as a young man"
Sample sentences: Somebody ----s PP

VB  be in order, become in order, form, fall in, draw up, arrange itself, range itself, place itself, fall into one's place, take one's place, take one's rank, rally round, adjust, methodize, regulate, systematize.

VB  follow in a series, form a series, fall in, arrange in a series, collate, string together, file, thread, graduate, organize, sort, tabulate.

VB  happen, occur, take place, take effect, come, become of, come off, comeabout, come round, come into existence, come forth, come to pass, come on, pass, present itself, fall, fall out, turn out, run, be on foot, fall in, befall, betide, bechance, prove, eventuate, draw on, turn up, crop up, spring up, pop up, arise, show up, show its face, appear, come forth, cast up, supervene, survene, issue, arrive, ensue, arise, start, hold, take its course, pass off, meet with, experience, enjoy, encounter, undergo, suffer, pass through, go through, be subjected to, be exposed to, fall to the lot of, be one's chance, be one's fortune, be one's lot, find, endure.

fall, fall all over, fall apart, fall armyworm, fall asleep, fall away, fall back, fall behind, fall by the wayside, fall cankerworm, fall dandelion, fall down, fall equinox, fall flat, fall for, fall from grace, fall guy, fall in line, fall in love, fall in with, fall into, fall into place, fall of man, fall off, fall open, fall out, fall over, fall over backwards, fall short, fall short of, fall through, fall to, fall to pieces, fall under, fall upon, fall webworm, free fall