1.  let in(v = verb.social) admit, include - allow participation in or the right to be part of; permit to exercise the rights, functions, and responsibilities of; "admit someone to the profession"; "She was admitted to the New Jersey Bar"
is one way to allow, countenance, let, permit
Sample sentences: Somebody ----s somebody; Somebody ----s somebody PP

2.  let in(v = verb.social) admit, allow in, intromit - allow to enter; grant entry to; "We cannot admit non-members into our club building"; "This pipe admits air"
is one way to allow, countenance, let, permit
Sample sentences: Somebody ----s somebody; Something ----s something; Somebody ----s somebody PP

VB  lie between, come between, get between, intervene, slide in, interpenetrate, permeate, put between, introduce, import, throw in, wedge in, edge in, jam in, worm in, foist in, run in, plow in, work in, interpose, interject, intercalate, interpolate, interline, interleave, intersperse, interweave, interlard, interdigitate, sandwich in, fit in, squeeze in, let in, dovetail, splice, mortise, insinuate, smuggle, infiltrate, ingrain, interfere, put in an oar, thrust one's nose in, intrude, obtrude, have a finger in the pie, introduce the thin end of the wedge, thrust in.

VB  give entrance to, give admittance to, give the entree, introduce, intromit, usher, admit, receive, import, bring in, open the door to, throw in, ingest, absorb, imbibe, inhale, breathe in, let in, take in, suck in, draw in, readmit, resorb, reabsorb, snuff up, swallow, ingurgitate, engulf, engorge, gulp, eat, drink.

VB  deceive, take in, defraud, cheat, jockey, do, cozen, diddle, nab, chouse, play one false, bilk, cully, jilt, bite, pluck, swindle, victimize, abuse, mystify, blind one's eyes, blindfold, hoodwink, throw dust into the eyes, dupe, gull, hoax, fool, befool, bamboozle, flimflam, hornswoggle, trick, impose upon, practice upon, play upon, put upon, palm off on, palm upon, foist upon, snatch a verdict, bluff off, bluff, bunko, four flush, gum, spoof, stuff (a ballot box), circumvent, overreach, outreach, out wit, out maneuver, steal a march upon, give the go-by, to leave in the lurch decoy, waylay, lure, beguile, delude, inveigle, entrap, intrap, ensnare, nick, springe, set a trap, lay a trap, lay a snare for, bait the hook, forelay, spread the toils, lime, trapan, trepan, kidnap, let in, hook in, nousle, nousel, blind a trail, enmesh, immesh, shanghai, catch, catch in a trap, sniggle, entangle, illaqueate, hocus, escamoter, practice on one's credulity, hum, humbug, gammon, stuff up, sell, play a trick upon one, play a practical joke upon one, put something over on one, put one over on, balk, trip up, throw a tub to a whale, fool to the top of one's bent, send on a fool's errand, make game, make a fool of, make an April fool of, make an ass of, trifle with, cajole, flatter, come over, gild the pill, make things pleasant, divert, put a good face upon, dissemble, cog, cog the dice, load the dice, stack the deck, live by one's wits, play at hide and seek, obtain money under false pretenses, conjure, juggle, practice chicanery, deacon, play off, palm off, foist off, fob-off, lie, misinform, mislead, betray, be deceived.

let, let alone, let be, let down, let drive, let drop, let fly, let fly at, let go, let go of, let in on, let it go, let loose, let off, let on, let out, let pass, let ride, let slide, let slip, let the cat out of the bag, let up, let well enough alone, live and let live