Where does “coachweed” come from?

coachweed (English) comes from English coach, from Middle French coche, from German Kutsche, from French couché, from French coucher, from Middle French coucher, from Old French couchier, from Latin collocō — resin, gum; to say, speak.

Ancestry of “coachweed”, step by step

coachweed traces back through two separate lines of ancestry.

via English coach

StepLanguageWordMeaning
1EnglishcoachA wheeled vehicle, generally drawn by horse...
2Middle Frenchcoche
3GermanKutschecarriage; coach; A large, old automobile in poor...
4Frenchcouchépast participle of coucher; in bed
5Frenchcoucherto lay, to lay down; to put to bed, to put up; to...
6Middle Frenchcoucherto put to bed; setting
7Old Frenchcouchierto go to bed; to have sex; bedtime
8Latincollocōto place, put, set in order, assign, arrange
9Latincōn-Used in compounds to indicate a being or bringing together of several objects
10Latincumwith, along with; at; -fold
11Old LatincomAlternative form of cum
12Proto-Italickomwith, along, at
13Proto-Indo-Europeanḱómbeside, near, by, with
14Proto-Indo-EuropeanḱeDeictic particle, here; Post-positional...
15Middle Englishkyt
16Germankittputty certain kinds of cement used for fixing e.g. window panes
17Old High Germankuti
18Proto-West Germanickwidugum, resin
19Proto-Germanickweduzresin
20Proto-Indo-Europeangʷet-resin, gum; to say, speak

via English weed

StepLanguageWordMeaning
1EnglishweedAny plant regarded as unwanted at the place...
2Middle Englishweed
3Old Englishwēodweed
4Proto-West Germanic*weudweed (unwanted plant)
Every word from Proto-Indo-European gʷet-Every word from Latin cōn-Every word from Proto-Germanic kweduz