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sis

Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ -> The fool laughs even when there's nothing to laugh at
Menander

Latin > English (Lewis & Short)

sīs:
I Subj. of sum.—
II Contr. from si vis; v. volo init.—
III I. q. suis, v. suus init.

Latin > French (Gaffiot)

(1) sīs = si vis, si tu veux, s’il te plaît, de grâce : Pl., Ter. ; Cic. Amer. 48 ; Mil. 60.
(2) sīs, subj. prés. de sum.
(3) sīs, v. suus.

Latin > German (Georges)

sīs zsgz. aus si vis, Adv., wenn du willst, doch, Cic. u.a.