crackdown (n.)youdaoicibaDictYouDict[crackdown 词源字典]
also crack down; 1935, from the verbal phrase (1915), from crack (v.) + down (adv.); probably from the sense of "to shoot at" (1913).
These scab contractors probably think that they have us whipped, but they are badly mistaken. With the reorganization of the Building Trades Council, which is progressing nicely, we will be in a position to cope with them and when we do crack down on them they will have to come across or get out. ["Journal of Electrical Workers and Operators," September 1915]
[crackdown etymology, crackdown origin, 英语词源]
embrace (v.)youdaoicibaDictYouDict
mid-14c., "clasp in the arms," from Old French embracier (12c., Modern French embrasser) "clasp in the arms, enclose; covet, handle, cope with," from assimilated form of en- "in" (see en- (1)) + brace, braz "the arms," from Latin bracchium (neuter plural brachia); see brace (n.). Related: Embraced; embracing; embraceable. Replaced Old English clyppan (see clip (v.2)), also fæðm (see fathom (v.)). Sexual sense is from 1590s.
hack (v.1)youdaoicibaDictYouDict
"to cut roughly, cut with chopping blows," c. 1200, from verb found in stem of Old English tohaccian "hack to pieces," from West Germanic *hakkon (cognates: Old Frisian hackia "to chop or hack," Dutch hakken, Old High German hacchon, German hacken), from PIE *keg- "hook, tooth" (see hook (n.)). Perhaps influenced by Old Norse höggva "to hew, cut, strike, smite" (which is unrelated, from PIE *kau- "to hew, strike;" see hew). Slang sense of "cope with" (as in can't hack it) is first recorded in American English 1955, with a sense of "get through by some effort," as a jungle (phrase hack after "keep working away at" is attested from late 14c.). To hack around "waste time" is U.S. slang, by 1955, perhaps originally of golfers or cabbies. Related: Hacked; hacking.
heliometeryoudaoicibaDictYouDict
"A refracting telescope with a split objective lens, used for finding the angular distance between two stars", Mid 18th century: from helio- 'of the sun' + -meter (because it was originally used for measuring the diameter of the sun).