Selected letter U
Unparliamentary language breaks the rules of politeness in the House of Commons Chamber. The Speaker will direct an MP who has used unparliamentary language to withdraw it. Refusal to withdraw a comment might lead to an MP being disciplined for example the Speaker could 'name' the Member.
Words to which objection has been taken by the Speaker over the years include blackguard, coward, git, guttersnipe, hooligan, rat, swine, stoolpigeon and traitor.