Latin word supplicare comes from Latin plico, Latin plicare, Latin sub- (Sub-.)
plico (Latin)
(transitive) I arrive (this meaning comes from sailors, for whom the folding of a ship’s sails meant arrival on land). (transitive) I fold, bend or flex; I roll up.
plicare (Latin)
sub- (Latin)
Sub-.
supplico (Latin)
I humbly beseech or beg. I pray or supplicate.