(slang) prison

euglena

bloodworm, various worms of the family Eunicidae; often used as fishing bait or fish food / red velvet mite, harvest mite, various mites of the family Trombidiidae; (especially) Trombicula akamushi

(rare, obsolete) a textile made from this thread / (rare, obsolete) the ramie plant / (rare, obsolete) a thread made from the fibers of this plant

blackfly

a bug, insect, worm / a serpent, snake / (figurative): a worm (person living for only one thing) / (derogatory): a worm (despicable person) / a temperament (thought which is in the deep in mind)

a bad tooth, dental caries, a cavity

(slang, sumo) the lowest rank in major-league sumo, so called because the 力士 (rikishi, “sumo wrestler”) names are displayed at the bottom of the 番付 (banzuke, “sumo rankings list or program”) in a small font, requiring the use of a magnifying glass to read easily

weakling, scaredy-cat

something done or given freely, as volunteer work or love / something free of charge; something for which no price is paid