coastyoudaoicibaDictYouDict[coast 词源字典]
coast: [13] Latin costa meant ‘rib’ (hence the English medical term intercostal ‘between the ribs’), but also more generally ‘flank, side’. It was in this sense that it passed into Old French as coste, and subsequently into English. The modern meaning ‘seashore’ (which had already developed in Old French) arises from the shore being thought of as the ‘side’ or ‘edge’ of the land (compare seaside).

Amongst the senses of the French word little represented in English is ‘hillside, slope’; it was however adopted in North America for a ‘slope down which one slides on a sledge’, and came to be used in the mid 19th century as a verb meaning ‘sledge down such a slope’. That was the source of the modern verbal sense ‘freewheel’. The coster of costermonger [16] was originally costard, a variety of apple named from its prominent ‘ribs’.

And another hidden relative is cutlet [18], borrowed from French côtelette, literally ‘little rib’.
=> costermonger, cutlet, intercostal[coast etymology, coast origin, 英语词源]
drag (v.)youdaoicibaDictYouDict
mid-15c., from Old Norse draga, or a dialectal variant of Old English dragan "to draw," both from Proto-Germanic *dragan "to draw, pull," from PIE root *dhragh- "to draw, drag on the ground" (cognates: Sanskrit dhrajati "pulls, slides in," Russian drogi "wagon;" but not considered to be directly the source of Latin trahere).

Meaning "to take a puff" (of a cigarette, etc.) is from 1914. Related: Dragged; dragging. Drag-out "violent fight" is from c. 1859. To drag (one's) feet (1946, in figurative sense) supposedly is from logging, from a lazy way to use a two-man saw.