[rustproof] {adj.} Free from rusting or corrosion; permeated with anti-rust chemical […]

[rut] "Are you there?"

[S] "Smile", usually written *S* or <S> to separate it from […]

[S2R] "Send-to-receive"; indicates that one expects to receive a file (usually […]

[saber rattling] or [sword rattling] {n.} A show of military strength […]

[sack] See: [GET THE SACK] at [GET THE BOUNCE] (2), [GIVE […]

[sack in/out] {v.}, {slang} To go to sleep for a prolonged […]

[sacred cow] {n.} A person or thing that is never criticized, […]

[sacrifice fly] {n.} A baseball hit high in the air that […]

[sad sack] {n. phr.} {informal} An inept person who makes mistakes […]