(archaic) one who rules or commands a group of people: a chief

black belt

五日 (itsuka, go-nichi, “fifth (5th) day”) / 十日 (tōka, jū-nichi, “tenth (10th) day”) / 十五日 (jūgo-nichi, “fifteenth (15th) day”) / 二十日 (hatsuka, nijū-nichi, “twentieth (20th) day”)

to wear (a sword, decoration, etc.); to carry / to be entrusted (e.g. with a mission); to take on / to have a trace of; to be tinged with

A sash that is tied around the top edge of the obi which covers the obimakura "pillow".

A small pillow that is tied under the obi at the back which gives the obi musabi or "knot" its volume.

kaku obi, a kind of stiff obi used by men

a nine-banded armadillo

Thank you for doing / Thank you for having done

play dumb, feign ignorance / (slang) evade one's responsibilities, especially by failing to appear to perform a duty