Webster's English Dictionary

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sheave

1. sheave \'shiv, 'she-v\ n [ME sheve; akin to OE sce-ath sheath] 1: the 
   grooved wheel or pulley of a pulley block  2: any grooved wheel or pulley 
2. sheave \'she-v\ vt [sheaf] : to gather and bind into a sheaf 
3. sheave \'she-v\ vi [perh. fr. ME scheven to shove, fr. OE sce-ofan, 
   alter. of sc]u-fan - more at SHOVE : to reverse the action of the oars in 
   rowing a boat