湿気る
しける · shikeru · JLPT N1 · noun
damp
💧 湿 (wet) + 気 (air/feeling): the air feels wet, so things turn damp
湿気 means humidity, and its verb 湿気る means to become damp. Crackers left out in humid air go soggy, which is the usual sense of shikeru.
湿 — water 氵 + 㬎 (phonetic, 'visible')
湿 originally depicted dampness, combining the water radical 氵 with 㬎, which suggests sun shining on silk threads being dried. The water component carries the meaning 'wet/damp,' while 㬎 hints at the pronunciation. Modern simplified form 湿 replaced traditional 濕.