Not following the planned, or intended, route.

Misspelling of of course.

(nautical) On a mizzenmast, the lowest sail

plural of golf course

(idiomatic) A natural or logical outcome. / (idiomatic) An expected or customary outcome.

(construction) A sacrificial material used to shield a waterproofing material from damaging external forces.

(roofing) The last or top course of roofing materials, such as tile, roll roofing, shingles, etc. that covers the ridge and overlaps the intersecting field roofing.

plural of crash course

The workload involved in an academic course. / The number and difficulty of courses taken in an academic setting.

plural of bird course