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bulk [bulk 词源字典]: bulk: [14] Formally, bulk comes from Old Norse búlki, which meant ‘cargo’ or ‘heap’: the original connotation of the English word in this sense was thus of goods loaded loose, in heaps, rather than neatly packed up. That is the source of the phrase in bulk. However, a certain similarity in form and meaning to the English word bouk ‘belly’ (from Old English būc, and ultimately a descendant of West and North Germanic *būkaz) led to the two being confused, so that bulk was used for ‘belly’, or more generally ‘body’.

Modern connotations of ‘great size’ seem to be a blend of these two. The bulk of bulkhead [15] is a different word; it may come from Old Norse bálkr ‘partition’.
[bulk etymology, bulk origin, 英语词源]
terse: terse: [17] Terse originally meant ‘polished, smooth’ (‘This man … so laboured upon it that he left it smooth and terse’, Helkiah Crooke, Description of the Body of Man 1615). By the 18th century, however, the associated notion of ‘neatness’ had led on to ‘neatly concise’. The word’s present-day negative connotations of ‘brusqueness’ seem to be a comparatively recent development. It was borrowed from tersus, the past participle of Latin tergēre ‘wipe’ (source also of English detergent).
=> detergent
neat (adj.): 1540s, "clean, free from dirt," from Anglo-French neit, Middle French net "clear, pure" (12c.), from Latin nitidus "well-favored, elegant, trim," literally "gleaming," from nitere "to shine," from PIE root *nei- "to shine" (cognates: Middle Irish niam "gleam, splendor," niamda "shining;" Old Irish noib "holy," niab "strength;" Welsh nwyfiant "gleam, splendor").

Meaning "inclined to be tidy" is from 1570s. Of liquor, "straight," c. 1800, from meaning "unadulterated" (of wine), which is first attested 1570s. Informal sense of "very good" first recorded 1934 in American English; variant neato is teenager slang, first recorded 1968. Related: Neatly; neatness.
terse (adj.): 1590s (implied in tersely), "clean-cut, burnished, neat," from French ters "clean," and directly from Latin tersus "wiped off, clean, neat," from past participle of tergere "to rub, polish, wipe." Sense of "concise or pithy in style or language" is from 1777, which led to a general sense of "neatly concise." The pejorative meaning "brusque" is a fairly recent development. Related: Terseness.
trim (adj.): c. 1500, "neatly or smartly dressed," probably ultimately from trim (v.) or from related Old English trum "firm, fixed, secure, strong, sound, vigorous, active." Related: Trimly; trimness.