crush (n.)youdaoicibaDictYouDict[crush 词源字典]
1590s, "act of crushing," from crush (v.). Meaning "thick crowd" is from 1806. Sense of "person one is infatuated with" is first recorded 1884; to have a crush on is from 1913.[crush etymology, crush origin, 英语词源]
dote (v.)youdaoicibaDictYouDict
c. 1200, "to be feeble-minded from age," from Middle Low German doten "be foolish," which is of unknown origin. Meaning "to be infatuated" is from late 15c. Related: Doted; dotes; doting.
infatuate (v.)youdaoicibaDictYouDict
1530s, "turn (something) to foolishness, frustrate," from Latin infatuatus, past participle of infatuare "make a fool of," from in- "in" (see in- (2)) + fatuus "foolish." Specific sense of "inspire (in someone) a foolish romantic passion" is from 1620s. Related: Infatuated; infatuating.
miser (n.)youdaoicibaDictYouDict
1540s, "miserable person, wretch," from Latin miser (adj.) "unhappy, wretched, pitiable, in distress," of unknown origin. Original sense now obsolete; main modern meaning of "money-hoarding person" recorded 1560s, from presumed unhappiness of such people.

Besides general wretchedness, the Latin word connoted also "intense erotic love" (compare slang got it bad "deeply infatuated") and hence was a favorite word of Catullus. In Greek a miser was kyminopristes, literally "a cumin seed splitter." In Modern Greek, he might be called hekentabelones, literally "one who has sixty needles." The German word, filz, literally "felt," preserves the image of the felt slippers which the miser often wore in caricatures. Lettish mantrausis "miser" is literally "money-raker."