口诀

mnemonic chant / rhyme for remembering (arithmetic tables, character stroke order etc)

kǒu = k + ou3

mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls

Mnemonic symbol: 口 shall be represented by a mandarin. Karl Marx (k-) is enjoying a mandarin in the outhouse's living room (ou3).

jué = ju + e2

to bid farewell / tricks of the trade / pithy mnemonic formula (e.g. Mao Zedong's 16-character mantra 十六字訣|十六字诀 on guerrilla warfare)

口诀 is not used as a component in another word.

口诀 currently does not appear in any sentence.