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Etymology
From.

Verb

 * 1) (river) to fall (into), to flow (into)
 * 2) (a condition) to fall (into), to lapse (into), to sink (into)
 * 3) (cheeks, eyes etc.) to sink in, to become hollow/sunken
 * 1) (cheeks, eyes etc.) to sink in, to become hollow/sunken
 * 1) (cheeks, eyes etc.) to sink in, to become hollow/sunken
 * 1) (cheeks, eyes etc.) to sink in, to become hollow/sunken
 * 1) (cheeks, eyes etc.) to sink in, to become hollow/sunken
 * 1) (cheeks, eyes etc.) to sink in, to become hollow/sunken
 * 1) (cheeks, eyes etc.) to sink in, to become hollow/sunken