plural of add on

(calculus) a covector field

(slang, basketball) A basketball player who plays college basketball for a single year and then declares for the NBA draft.

(obsolete, nonce word) secret

plural of strap on

plural of follow-on

(idiomatic, Northern England) Alone, on one's own.

plural of walk-on

Misspelling of one-sidedly.

plural of flick-on