Summon
Middle English: from Old French somondre, from Latin summonere ‘give a hint’, later ‘call, summon’, from sub- ‘secretly’ + monere ‘warn’.
wiktionary
From Anglo-Norman somoundre, from Old French sumundre, from Latin summonēre, itself from sub + monēre.
etymonline
summon (v.)
c. 1200, "call, send for, ask the presence of," especially "call, cite, or notify by authority to be at a certain place at a certain time" (late 13c.), from Anglo-French sumunre and directly from Old French somonre, variant of sumundre, somondre "summon," from Vulgar Latin *summundre "to call, cite," from Latin summonere "hint to, remind or advise privately," from assimilated form of sub "under" (see sub-) + monere "to admonish, warn, advise," from PIE *moneie- "to make think of, remind," suffixed (causative) form of root *men- (1) "to think." In part also from Medieval Latin use of summonere. Meaning "arouse, excite to action" is from 1580s. Related: Summoned; summoning.
