IPA: /əˈθwɔːrtʃɪp/
KK: /əˈθwɔrtˌʃɪp/
Describing a position that is across the width of a ship, from one side to the other.
The cargo was stored athwartship to balance the weight evenly.
In a direction that is across or at right angles to the length of a ship or boat.
The cargo was stored athwartship to balance the weight evenly.
Athwartship is formed from "athwart" (from Old English "aþweard", meaning across or in opposition) and "-ship" (a suffix denoting condition or quality). The term refers to the position or direction across the width of a ship.
Think of something positioned 'across' ('athwart') a ship, and the '-ship' indicates it relates to the condition or quality of being across.