Green’s Dictionary of Slang

suck in v.

1. to accept, to believe.

[UK]Leaves from Diary of Celebrated Burglar 125/1: Thee goa tu blazes, an’ thau skreet howls, duz thau think we’ve ban tu suck that in?

2. to deceive, to cheat; thus sucking-in n., deception, cheating; sucked in adj., cheated.

[US]Western Scenes in Schele De Vere (1872) 639: Speculating in land is all very well, and great fortunes can be made and have been made in that line. But, Colonel, mind my word, there’s a heap of sucking-in going on there, and my opinion is, you had better not venture too far at first.
[US]C.M. Kirkland Forest Life I 135: ‘I ain’t bound to drive nobody in the middle of the night,’ said the driver; ‘so you don’t try to suck me in there.’.
[US] ‘Doing a Sheriff’ in T.A. Burke Polly Peablossom’s Wedding 101: Before the ‘sucked in’ sheriff had recovered from his astonishment, the pony and his master were out of hearing.
[Aus]Bulletin (Sydney) 17 Jan. 7/1: Matrimony has its risks, I know; but if you get sucked in here you will be amply repaid in another place.
[UK]‘Doss Chiderdoss’ ‘Not a Bit Like It’ Sporting Times 15 Feb. 1/3: From a child he had always been sucked in by sham.
[US] ‘Central Connecticut Word-List’ in DN III:i 22: suck in, v. To cheat.
[UK]Marvel 15 Oct. 19: People suck you in.
[Aus]Aussie (France) VIII Oct. 6/2: ‘We’ve been sucked in,’ he said. ‘We’re a pair of mugs; in fact, we’re the whole blanky crockery-shop. An eiderdown quilt is real hard compared to us. God! we’re soft. [...] He’s bluffed us!’.
[US]Randolph & Pingry ‘Kansas University Sl.’ in AS III:3 221: Wayne sure got sucked in on that deal.
[UK]J. Curtis You’re in the Racket, Too 35: The old bitch would be properly sucked in this time.
[UK]C. Day Lewis Otterbury Incident 170: ‘Sucked in again!’ shouted Toppy. ‘It was only a dummy!’.
[US]J. Jones From Here to Eternity (1998) 337: Outsmarted. Sucked in like a green kid.
[US]H.E. Roberts Third Ear n.p.: suck in v. to deceive.
[US]H. Rawson Dict. of Invective (1991) 376: suck in, to cheat.