In a manner resembling or characteristic of a crane; with a crane's distinctive posture or movement.
From 'crane' plus the adjective suffix '-ly' (not to be confused with the adverb suffix). This archaic or rare formation means 'in the manner of a crane'.
English has surprisingly few '-ly' adjectives—most people think '-ly' only makes adverbs, but 'cranely' shows how English speakers could describe something as 'crane-ish' by stacking suffixes in creative ways!
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