泣く
なく · naku · JLPT N4 · verb-godan
to cry
😢 泣 = water 氵 + stand 立: water standing in the eyes; naku sounds like knock
The kanji joins the water radical 氵 with 立 (stand): tears are water that stands in the eyes before falling. Sound hook: naku is close to knock, so a hard knock makes you cry. Note 鳴く, also naku, is for animal cries.