-st

variant of -est¹: first; least.

-st

variant of -est²: hadst; wouldst; dost.

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British Dictionary definitions for -st

-st

suffix

a variant of -est 2

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012