The lìn reading covers 'to filter or strain' and the medical sense seen in 淋病 (gonorrhea). In traditional medicine it also names painful or dripping urination. The common 'pour / drench' verb is the separate reading lín.
Three-drop water radical on the left, the side-stacking form of 水. Marks the character as a liquid-pouring action: drenching, drizzling, pouring water down. Family of pour-related verbs: 浇 (sprinkle), 泼 (splash), 滴 (drip), 洒 (scatter).
Right 林 (two trees = grove) supplies the sound lín exactly. The image is also evocative: water raining down through a forest canopy, drops falling steadily, a useful mnemonic for 'drench, drizzle'. Same phonetic family: 琳 (fine jade), 临 (approach), 霖 (downpour).
