To not know anything about something.

(colloquial, dated) Not a bit; not in the least.

(finance) One should invest based on the management team behind a venture, rather than on the product or service being sold.

(medicine, informal) When diagnosing a patient's symptoms, common ailments should be considered as more probable than rare ones.

Alternative form of bet the jockey, not the horse

(chiefly philosophy) The quality of an action being morally obligatory not to perform.

(Internet slang) Expressing complete rejection or aversion; no way.

Alternative form of people who live in glass houses shouldn't throw stones

Alternative form of people who live in glass houses shouldn't throw stones

Alternative form of people who live in glass houses shouldn't throw stones