In such a manner as. / With such a purpose as. / If only; on condition that.

To such a great extent.

The conventional Morse code call made by a ship in distress.

Initialism of Secretary of State. / Initialism of special order sale.

(colloquial) Initialism of slip on show: a warning to a woman that the underwear she has on can be seen.

(games) A children's game in which players take turns to place S's and O's on a grid, collecting points by creating an "SOS" sequence.

Initialism of shit on a shingle.

Initialism of Shorter Oxford English Dictionary.

Initialism of sudden-onset explosive diarrhea.

plural of so