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Related to guest: house guest, Be My Guest

be my guest

A set phrase encouraging or allowing someone else to take action. A: "Do you mind if I order another glass of wine?" B: "Not at all—be my guest."
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Be my guest.

Help yourself.; After you. (A polite way of indicating that someone else should go first, help himself or herself to something, or take the last one of something.) Mary: I would just love to have some more cake, but there is only one piece left. Sally: Be my guest. Mary: Wow! Thanks! Jane: Here's the door. Who should go in first? Bill: Be my guest. I'll wait out here. Jane: You're so polite!
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guest of honor

a guest who gets special attention from everyone; the person for whom a party, celebration, or ceremony is given. Bob is the guest of honor, and many people will make speeches about him. The guest of honor sits at the front of the room on the dais.
See also: guest, honor, of

be my guest

Do as you wish. For example, May I drive your car?-Sure, be my guest, or Do you mind if I go to the play without you?-No, be my guest. This expression not only literally invites someone to behave as one's guest (using one's house, belongings, etc.) but also figuratively tells someone to feel free to act as he or she pleases. [Colloquial; c. 1950] Also see feel free.
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be my guest

1. You say be my guest to someone to politely give them permission to do something. `Do you mind if I use the phone?' — `Be my guest.'
2. You say be my guest to someone to say that you are happy to let them do something unpleasant or difficult instead of you. If you want to tell her the bad news, Maria, be my guest.
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be my guest

please do. informal
1988 Jay McInerney The Story of My Life I'll hurt myself, Mannie screams. Be my guest, says Rebecca.
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be my ˈguest

(informal) used to give somebody permission to do something that they have asked to do: ‘May I look at this book?’ ‘Be my guest.’
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be my guest

Go ahead, do or take what you asked for. This casual expression, current since about 1950, generally is a response to a request for something trivial, as in “May I see your program?—Be my guest.” Eric Partridge reported that the phrase was so common by 1972 that it was used for the name of a racehorse that won quite a few races.
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References in classic literature ?
All the circumstances after a murder,' said the guest soliloquising, 'must be dreadfully unpleasant--so much bustle and disturbance--no repose--a constant dwelling upon one subject--and the running in and out, and up and down stairs, intolerable.
I haven't the pleasure of much acquaintance with the gentleman,' returned his guest.
A little shudder passed through the wide-eyed guests.
I thank you, Sir Roger, for your hospitality," said Norman of Torn, with a low bow which included the spellbound guests.
Slaves were passing among the guests, distributing small musical instruments of a single string.
The guests had risen and were slowly making their way toward the expanse of scarlet sward at the south end of the gardens where the dance was to be held, when Djor Kantos came hurriedly toward Tara of Helium.
The king was delighted at this, and exclaimed to the Phaeacians, "Aldermen and town councillors, our guest seems to be a person of singular judgement; let us give him such proof of our hospitality as he may reasonably expect.
Also, set a copper on the fire and heat some water; our guest will take a warm bath; see also to the careful packing of the presents that the noble Phaeacians have made him; he will thus better enjoy both his supper and the singing that will follow.
Hepzibah had now poured out a cup of deliciously fragrant coffee, and presented it to her guest.
The guest responded to her tone by a smile, which did not half light up his face.
In obedience to the summons, there was a general gathering of rank, wealth, and beauty; and the wide door of the Province House had seldom given admittance to more numerous and honorable guests than on the evening of Lady Eleanore's ball.
After the ceremonial greetings had been paid, Lady Eleanore Rochcliffe stood apart from the mob of guests, insulating herself within a small and distinguished circle, to whom she accorded a more cordial favor than to the general throng.
Cedric and Athelstane were both dressed in the ancient Saxon garb, which, although not unhandsome in itself, and in the present instance composed of costly materials, was so remote in shape and appearance from that of the other guests, that Prince John took great credit to himself with Waldemar Fitzurse for refraining from laughter at a sight which the fashion of the day rendered ridiculous.
The count, by his guests, went into the drawing room.
Walking slowly over the lawn as he opened them, he found nothing but excuses for the absence of guests who had already accepted their invitations.