[surefire] {adj.} Without fail; effective; bringing actual results. * /During a […]

[surface] See: [SCRATCH THE SURFACE].

[surprise] See: [TAKE BY SURPRISE].

[survival of the fittest] {n. phr.} The staying alive or in […]

[suspicion] See: [ABOVE SUSPICION].

[SWAK] "Sealed with a kiss"

[SWALK] "Sealed with a loving kiss" (pre internet)

[swallow] See: [LOOK LIKE THE CAT THAT ATE THE CANARY].

[swallow hook, line, and sinker] See: [HOOK, LINE, AND SINKER].

[swallow one's pride] {v. phr.} To bring your pride under control; […]