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One of my competitors told me that another competitors' tactics were 'gnarly'.
It really depends upon the usage of the word... in the first usage, only the plural of the base word 'competitor' is used. But in the second usage, it is the pluralpossessive usage that places the apostrophe outside of the entire word. It is your decision whether or not to add an additional 's' after the apostrophe.
See the related link posted below for more information:
What else can I help you with?
Can you use competitors in a sentence?
If we don't give the best service to our customers, they will soon be our competitors' customer.
Who are the competitors of iPods?
iZod, Zune, Sony, MP3's
Who were the top 10 competitors for figure skating and the country they represented?
2010's top 10 competitors for figure skating and the countries they represented
In which sport do competitors use bells and hoods?
fencing
Who became a monopoly by buying out smaller competitors?
yo mama's ( . Y . ) 's
In which sport do competitors use a tab and a chest guard?
Archery
In which recreatin do competitors often use ' tag and release'?
fishing
Which recreation do competitors often use tag or release?
They don't !!!!!!!!!!!!!!!!!!!¡¡
In which recreation competitors often use tag and and release?
billy
What sport do competitors use the outhandle to grasp the apparatus?
Gymnastics
How do you use this word Proselate in a sentence?
I do not proselate my services to your competitors
What are the types of competitors in the market?
business competitors business competitors business competitors business competitors business competitors
