κορώνη τὸν σκορπίον (ἥρπασε) = "a crow (caught) the scorpion" : "you bought off more than you can chew"
ἡ παροιμίᾱ = a proverb
ἡ κορώνη = a crow (note that European crows are GREY and black, not all black like in North America)
ὁ σκορπίος = a scorpion
ἁρπάζω · ἁρπάσω · ἥρπασα · ἥρπακα · ἥρπασμαι · ἡρπάσθην = to seize, to carry away
λείπει = it leave (out), as in, the proverb leaves something out; the verb is commonly left out since κορώνη τὸν σκορπίον conveys the meaning
βλαβερός -ά̄ -όν = harmful
δυσχερής -ές = difficult to deal with
τὸ κέντρον = the stinger (of the scorpion)
τὸ ἰόν = the poison
Composition practice for you:
Imagine your own examples in an original context, and write them below!