1580s, "put on shore, remove from on board a ship to land," also intransitive, "land from a ship, go on shore," from French desembarquer, from des- (see dis-) + embarquer (see embark). Related: Disembarkation; disembarked; disembarking.

1825, originally nautical, "on the level of, flush with" the water, from a- (1) "on" + wash (n.). The figurative use is by 1912.

1610s, "a brooding," from Latin incubationem (nominative incubatio) "a laying upon eggs," noun of action from past participle stem of incubare "to hatch," literally "to lie on, rest on," from in- "on" (from PIE root *en "in") + cubare "to lie" (see cubicle). The literal sense of "sitting on eggs to hatch them" in English is first recorded 1640s.

"that is on board," 1966 as one word, from the verbal phrase; see on + board (n.2). Originally of spaceships.

type of bun indented on top with an X, used especially on Good Friday, 1733, from cross (n.) + bun.

1718, "transport on a sled" (transitive); 1780, "ride on a sled" (intransitive), from sled (n.). Related: Sledded; sledder; sledding.

also infra-sonic, 1920, on the model of supersonic, etc., from infra- + sonic. Or perhaps modeled on French infra-sonore.

"to roost, to alight or settle on or as on a perch; to occupy some elevated position," late 14c., from Old French perchier "to sit on a perch" (of a bird), from perche (n.); see perch (n.1). Related: Perched; perching.

late 13c., "on the ground," from a- "on" (see a- (1)) + ground (n.). Of ships and boats, "stranded," from c. 1500.

"the practice of writing on the back of anything," 1715, from Greek opisthographos "written on the back," from graphos "writing" (from graphein"to write" (see -graphy) + opisthen "behind, from behind, at the back," from opi, a variant of epi "on it, at it" (see epi-).