Labour's John Woodcock has denied claims he swore at SNP MPs in the House of Commons.
Carol Monaghan said she was "outraged" by the language aimed at the SNP benches by Mr Woodcock, adding it was worse than anything she heard during her 20-year career as a teacher in Glasgow.
She asked Commons Speaker John Bercow for advice on how to make an official complaint.
But Mr Woodcock, who represents Barrow and Furness, said he hoped there had been a "genuine mishearing" from the Glasgow North West MP rather any "malicious" intent behind her concerns as he denied using language, which would result in a complaint.
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Mr Bercow said the allegation was that Mr Woodcock "had deployed an expletive".
But he said he could not comment on the claims as he did not hear any offensive or unparliamentary language from the Labour backbencher.
He also refused to tell MPs the word the SNP alleged was used during an urgent question on ship-building.
Raising a point of order, Ms Monaghan told Mr Bercow: "In 20 years of teaching in a comprehensive school in Glasgow I've never been subjected to language such as members on these benches were subjected to earlier by (Mr Woodcock).
"I'd like to ask you how we on these benches go about making an official complaint?"
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Mr Woodcock told Mr Bercow: "I can only hope that this is a genuine mishearing from (Ms Monaghan) and isn't malicious because I have to say I have learnt my lesson from my misplaced social media in the last couple of weeks, and I have to say I certainly did not use any language which (Ms Monaghan) should complain about.
"I'm slightly at a loss of what to say."
Referring to the SNP, he added: "I've heard of growing concerns about the tactics of those on the benches there who do, to an extent, seem to believe that the kind of intimidation that was practised on the streets of Scotland to shut down free debate during the referendum campaign, they seem to think it's acceptable to bring that into the chamber - whereas in my view it's acceptable neither on the streets nor here."
Mr Bercow, in his reply, said: "I did not hear it and I cannot therefore comment on it. I'm not prepared to get involved or to subject the House to getting involved in an ongoing exchange.
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"Suffice to say, at the time there was some discontent between the two sets of benches I did urge people to calm down and I stand by that.
"I'm genuinely sorry if there are members who feel offended but I cannot condemn that which I did not hear."
Mr Bercow added to Mr Woodcock: "A complaint was made to me that you had used bad language and you had deployed an expletive.
"I did not hear any such deployment and therefore you have been convicted of nothing. An allegation has been made, it was reported to me, I have no reason to accuse anybody of dishonesty."
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