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Etymology · Proto-Indo-European

*seykʷ-

3 English words descend from Proto-Indo-European *seykʷ-, most common first.

seaA large body of salt water.
sieTo sink; fall; drop.
sighTo inhale a larger quantity of air than usual, and immediately expel it; to make a deep single audible respiration, especially as the result or involuntary expression of fatigue, exhaustion, grief, sorrow, frustration, or the like.