simple past tense and past participle of open a can of whoop ass

(computing) a proxy server that may be accessed by any Internet user

(mathematics) A half space that does not include the plane that bounds it

(genetics) A sequence of DNA triplets, between the initiator and terminator codons, that can be transcribed into mRNA and later translated into protein.

An electronic device used to open a garage door remotely.

(finance) A collective investment scheme which can issue and redeem shares at any time.

(idiomatic) To remain vigilant for someone or something. / (idiomatic) To remain vigilant for a possibly dangerous situation.

A problem with an easy solution.

An interior of a building constructed with few walls or obstructions, giving a communal aspect.

plural of open and shut case