久攻不下

久 = ㇏ + 勹 : Mnemonic symbol: hourglass.

久 = ㇏ + 勹 : Joan of Arc and the elephant are visiting the outhouse, and they have been looking at the Mona Lisa for hours. Impatiently, Joan of Arc looks at her hourglass telling them that they have been standing there like that for three and a half hours, so she's poking the elephant with a finger to tell him to move on.

攻 = 工 + 攵 : In front of the engine, Gitta Giraffe attacks a steel beam using a sledge hammer. Who will win???

不 = 丆 + 卜 : Bruno Bear (bu) is setting up a wind wheel (丆) with a voodoo staff (卜) in the space station's bathroom (Ø4). He also puts a "forbidden" sign (mnemonic symbol for 不) on it, to make clear that it may not (不) be stopped.

下 = 一 + 卜 : Mnemonic symbol: from the up/down logic, and a little bit the shape of the character, a ladder.

Xi Shi (xi) is on a retreat in the ashram. Using a voodoo staff (卜), she divined that next (下) week she'll have to play the flute (一) sixteen hours per day. Because she hates playing the flute, she climbs over the ashram's bathroom (a4) wall using a ladder (下) to escape.