1. [1920s+] (UK Und.) to confess or turn informer to the police or similar authority.
2. [1950s+] (US black/campus, also talk to/with) to have a relationship with someone, to date.
3. [1970s+] (US prison) having a relationship with another person of the same sex while in prison [euph.].
SE in slang uses
[1990s+] (US) a psychoanalyst, a psychotherapist.
[20C+] (US) the mouth.
[19C] (US) all theory and no practice, all proposals and no concrete results.
[20C+] an excuse for any excessive talk or actions when drunk, either at the time or when sober on reflection; thus n. beer talk.
[mid-19C+] a phr. stating that the speaker is (finally) dealing with pertinent topics or talking to some purpose.
see also under relevant n. or adj.
see talk someone blind under blind adv.1
[2000s] (N.Z.) to be drunk.
[1910s–20s] to say unpleasant things.
[late 19C–1930s] (Scot.) drunk.
to answer, to speak up.
[1950s] to talk in an affected, supposedly ‘classy’ manner.
[mid-19C+] to talk incessantly.
[1970s+] to talk nonsense (cf. talk out of one’s arsehole under arsehole n.).
[20C+] to tell tales, to talk unguardedly.
[mid-19C+] to change one’s mind, to contradict an earlier statement.
[1990s+] to talk nonsense.
[late 18C–early 19C] to talk in double entendres.
[late 19C–1910s] (mainly Aus.) to speak in an affectionate, friendly manner.
[1910s+] (US prison) to talk disrespectfully, to talk ‘clever’.
see under ear n.1
[1920s+] (orig. US) to talk incessantly at someone.
[1950s] to talk very fast and unintelligibly.
[1900s] (Aus.) to talk nonsense.
[1950s] to talk nonsense.
[late 18C] of women, to talk smut.
[1960s+] (US) to perform cunnilingus.
[1940s+] to talk in a fluent, persuasive manner.
[1940s+] (US) to talk loudly, at length and impressively.
[1950s] (US black) to threaten to leave.
[1960s+] a use of SE talking with the word ‘about’ unstated, implying not so much person-to-person communication, but as a way of emphasizing the importance and immediacy of the topic in hand, e.g. we’re talking telephone numbers, this will be a very large sum of money.