Hong Kong Chinese said:
Please point out my mistakes!
Euphemism
Kick the bucket, pass away=die
Powder room, rest room=toilet
I’m afraid I can help you=I can’t help your for whatever the reasons are!
Mensuel cycle = period
To sleep with someone = to have sex with someone
Call girls = prostitutes
Not-so-beautiful, nice, cute = ugly
Senior citizens = old people
What is the antonym of euphemism?
Malphemism????
Coffin nail=cigarette
I wouldn't call all of these euphemisms. The list is a mixture of slang, idioms, and euphemisms. Remember that a euphemism is s softer language substitute.
There is some overlap, but I would divide them this way:
Kick the bucket, pass away=die (slang, euphemism)
Powder room, rest room=toilet (that depends on English variety; in American English the "toilet" is a plumbing fixyure, not a room)
I’m afraid I can
[sic] help you=I can’t help your for whatever the reasons are! (normal English)
Mensuel cycle = period (euphemism)
To sleep with someone = to have sex with someone (euphemism)
Call girls = prostitutes (possibly euphemism)
Not-so-beautiful, nice, cute = ugly (normal English)
Senior citizens = old people (euphemism)