horse (animal) / Ellipsis of koń gimnastyczny (“pommel horse”). / knight

a masculine surname / a feminine surname

horsepower

(idiomatic) dark horse (someone who possesses talents or favorable characteristics that are not known or expected by others)

(Greek mythology) Trojan horse (epic wooden horse) / (idiomatic) Trojan horse (subversive person or device) / (computing, idiomatic) trojan (malware)

(intransitive, simile, colloquial, idiomatic, derogatory) to overcomplicate, to come up with unnecessarily clever ways of solving a problem instead of using well-known solutions / (intransitive, simile, colloquial, idiomatic, derogatory) to put a lot of inept effort into something, especially by using trial and error

(transitive) to end, to finish / (transitive) to stop, to quit / (transitive) to turn, to reach a certain age / (reflexive) to end, to finish [+intrumental = in/as what] / (reflexive) to run out of / (reflexive) to die

(relational) horse; equine

locative/vocative singular of koniec

genitive singular of koniec