bunker (n.)youdaoicibaDictYouDict
1758, originally Scottish, "seat, bench," of uncertain origin, possibly a variant of banker "bench" (1670s; see bank (n.2)); possibly from a Scandinavian source (compare Old Swedish bunke "boards used to protect the cargo of a ship"). Of golf courses, first recorded 1824, from extended sense "earthen seat" (1805); meaning "dug-out fortification" probably is from World War I.
dugout (n.)youdaoicibaDictYouDict
also dug-out, "canoe," 1722, American English, from dug, past participle of dig (v.) + out (adv.). Baseball sense is first recorded 1914, from c. 1855 meaning of "rough shelter."
pirogue (n.)youdaoicibaDictYouDict
1660s, from French pirogue, probably from Galibi (a Carib language) piragua "a dug-out." Compare Spanish piragua (1530s).