In a manner characterized by crouching or bending low; with a stooped or hunched posture.
From crouching (present participle of crouch) + -ly (adverb suffix). This combines the Middle English 'crouchen' (possibly from Old Norse) with the standard English adverbial marker.
Adverbs ending in -ingly often describe continuous actions—like 'laughingly' or 'surprisingly'—and 'crouchingly' captures the visual comedy of someone moving while permanently bent over!
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