IPA: /ˈlæfɪŋstɒk/
KK: /ˈlæfɪŋstɑk/
A person or thing that is laughed at or ridiculed by others.
After his embarrassing mistake, he became the laughingstock of the entire school.
Laughingstock is formed from "laughing" (the present participle of "laugh", which comes from Old English "hlæhhan", meaning to express mirth) and "stock" (from Old English "stoc", meaning a tree trunk or a place). The term refers to a person or thing that is the subject of laughter or ridicule, as if they are a mere object of amusement.
Think of someone who is the 'object' ('stock') of laughter ('laughing') — that's why a laughingstock is someone who is ridiculed.
No commonly confused words.