(colloquial) current boyfriend

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)

everyone, one and all

a unicycle

(often attributive) underwater

reservoir

column of water

Alternative spelling of 一輪車 (“unicycle”)

the best or top person, such as the best performer in a company, or a leading expert

The hiragana syllable す (su). Its equivalent in katakana is ス (su). It is the thirteenth syllable in the gojūon order; its position is さ行う段 (sa-gyō u-dan, “row sa, section u”).