let in on - Definitions from Dictionary.com

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let1

Audio Help [let] Pronunciation Key verb, let, let·ting, noun

–verb (used with object)

1.	to allow or permit: to let him escape.

2.	to allow to pass, go, or come: to let us through.

3.	to grant the occupancy or use of (land, buildings, rooms, space, etc., or movable property) for rent or hire (sometimes fol. by out).

4.	to contract or assign for performance, usually under a contract: to let work to a carpenter.

5.	to cause to; make: to let one know the truth.

6.	(used in the imperative as an auxiliary expressive of a request, command, warning, suggestion, etc.): Let me see. Let us go. Just let them try it!

–verb (used without object)

7.	to admit of being rented or leased: The apartment lets for $100 per week.

–noun

8.	British. a lease.

—Verb phrases

let down,

a.	to disappoint; fail.

b.	to betray; desert.

c.	to slacken; abate: We were too near success to let down in our efforts.

d.	to allow to descend slowly; lower.

e.	Aeronautics. (of an airplane) to descend from a higher to a lower altitude preparatory to making an approach and landing or a similar maneuver.

10.

let in,

to admit.

b.	to involve (a person) in without his or her knowledge or permission: to let someone in for a loss.

c.	Also, let into. to insert into the surface of (a wall or the like) as a permanent addition: to let a plaque into a wall.

d.	Also, let in on. to share a secret with; permit to participate in.

11.

let off,

a.	to release by exploding.

b.	to free from duty or responsibility; excuse.

c.	to allow to go with little or no punishment; pardon: The judge let off the youthful offender with a reprimand.

12.

let on,

a.	to reveal one's true feelings: She was terrified at the prospect, but didn't let on.

b.	to pretend: They let on that they didn't care about not being invited, but I could tell that they were hurt.

13.

let out,

a.	to divulge; make known.

b.	to release from confinement, restraint, etc.

c.	to enlarge (a garment).

d.	to terminate; be finished; end: When does the university let out for the summer?

e.	to make (a let-out fur or pelt).

14.

let up,

a.	to slacken; diminish; abate: This heat wave should let up by the end of the week.

b.	to cease; stop: The rain let up for a few hours.

15.	let up on, to treat less severely; be more lenient with: He refused to let up on the boy until his grades improved.

—Idioms

16.	let alone. alone (def. 8).

17.

let be,

a.	to refrain from interference.

b.	to refrain from interfering with.

18.	let go. go (def. 82).

19.	let someone have it, Informal. to attack or assault, as by striking, shooting, or rebuking: The gunman threatened to let the teller have it if he didn't move fast.

[Origin: bef. 900; ME leten, OE lǣtan; c. D laten, G lassen, ON lāta, Goth létan; akin to Gk lédeǐn to be weary, L lassus tired. See late

]

—Synonyms 1. See allow. 1. suffer, grant. 3. lease, rent, sublet, hire.

—Antonyms 1. prevent.

—Usage note Let us is used in all varieties of speech and writing to introduce a suggestion or a request: Let us consider all the facts before deciding. The contracted form let's occurs mostly in informal speech and writing: Let's go. Let's not think about that right now. Perhaps because let's has come to be felt as a word in its own right rather than as the contraction of let us, it is often followed in informal speech and writing by redundant or appositional pronouns: Let's us plan a picnic. Let's you and I (or me) get together tomorrow. Both Let's you and me and Let's you and I occur in the relaxed speech of educated speakers. The former conforms to the traditional rules of grammar; the latter, nonetheless, occurs more frequently. See also leave¹.

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let in on

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Kernerman English Multilingual Dictionary - Cite This Source - Share This
let in on

to allow to share (a secret etc)
Example: We'll let her in on our plans.

Arabic:	يُطْلِع، يُشاركُ الأسْرار
Chinese (Simplified):	让知道
Chinese (Traditional):	讓知道
Czech:	zasvětit
Danish:	indvie i
Dutch:	betrekken bij
Estonian:	pühendama
Finnish:	päästää osalliseksi
French:	mettre au courant
German:	einweihen
Greek:	ενημερώνω, μοιράζομαι κτ. με κπ. (π.χ. μυστικό)
Hungarian:	beavat (titokba stb.)
Icelandic:	deila leyndarmáli
Indonesian:	memberitahukan
Italian:	mettere al corrente*

Japanese:	～に打ち明ける
Latvian:	uzticēt (noslēpumu u.tml.)
Lithuanian:	atskleisti
Norwegian:	dele (en hemmelighet) med, innvie i
Polish:	wtajemniczyć
Portuguese (Brazil):	deixar partilhar
Portuguese (Portugal):	partilhar
Romanian:	a destăinui
Russian:	посвящать
Slovak:	zasvätiť
Slovenian:	zaupati
Spanish:	dejar participar
Swedish:	inviga i
Turkish:	söylemek, açmak