In primary school (grade 6), I was explicitly taught in grammar class that * single = one * couple = two * few = three or four * many = five or more Both s

In primary school (grade 6), I was explicitly taught in grammar class that * single = one * couple = two * few = three or four * many = five or more Both single and couple seem very well cemented to me, people say "he's single" or "they're a couple", and there is no confusion there. But few and many were hammered into my head with equal certainty.