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Latin word substare comes from Latin sto, Latin sub, Latin sub- (Sub-.)
sto (Latin)
(Medieval Latin) I [currently] am (feel). (Medieval Latin) I am [located at]. I stand. I stay, remain.
sub (Latin)
(with ablative) about, around (time). (with ablative) at the feet of. (with ablative) behind. (with ablative) under, beneath. (with ablative) within, during. (with accusative) under, up to, up under, close to (of a motion). (with accusative) until, before, up to, about.
sub- (Latin)
Sub-.
substo (Latin)