finish in one sentence (spoken)

generally speaking

speaking of the devil and he shall appear, when something / someone being discussed appear unexpectedly

Synopsis explain

lecture on

talk nonsense

talk rubbish; talk nonsense

someone who says things said by others, meaning a person lacks the critical and analytical skills to process information

what the fuck are you talking about? [colloquial]

'did you say something?' (said in a rhetorical way when you try to mock someone if you disagree with what they have said or think they are talking a load of nonsense) [colloquial]

absolutely; needless to say (spoken)

to say

nothing to say

ruthless

did not mention

say again, talk again; furthermore

so you think you are haggling for vegetables at a market is it? (said in a manner to express that one going to stand firm and not going to accept any lower price offer) [colloquial]

can only say

now we are not talking about play, it means it's serious

not only, or do not say

one must watch what comes out of their mouth (what they say) more so than what they put into their mouth (what they eat) [colloquial]

to say so / to put it this way

regarding

strictly speaking

describes a person who tries to act smart and always exaggerates the actual situation of the matter(s) or event(s) and / or often tells something which is over-the-top; all mouth and no trousers

intercom

Cut the crap

'all bark and no bite'; all talk and no action; 'all mouth and no trousers'

offending remark

an unethical way of business dealing where the trader indirectly forces the customer to pay a higher price afterwards when it is too late to reverse the deal