Green’s Dictionary of Slang

1. to throw away; to discard [abbr. SE throw in the bin].

1996		A. Close Official and Doubtful 62: When I flitted to Mount Florida the landlord must have binned them.
2000		Guardian Rev. 8 Jan. 12: There were some letters disagreeing [...] so I binned them.
2014		Spectator 4 Oct. 13/2: Bin your boyfriend or your girlfriend unceremoniously and by the end of the day you might find intimate snaps of yourself [on] the social network sites.
2020		A. Parks Bobby March Will Live Forever 144: ‘Cooper wasnae that happy when he discovered his stash had been binned on your say-so’.

2. to commit to a psychiatric institution [bin n. (4)].

1967		I. Rosenthal Sheeper 236: Only a question of time before we’re all binned.
1989		J. Morton Lowspeak.