IPA: /əˈθwɔrtˌʃɪps/
KK: /əˈθwɔrtˌʃɪps/
In a direction that goes from one side of a ship to the other side.
The cargo was stored athwartships to balance the weight evenly.
Athwartships is formed from "athwart" (from Old English "aþweard", meaning across or in opposition) and "ships" (the plural of "ship", which comes from Old English "scip", meaning a vessel for travel on water). The term refers to something positioned across the width of a ship.
Think of something that is 'across' ('athwart') a 'ship' — this helps you remember that 'athwartships' means across the width of a ship.