cinch / sinh [sɪntʃ]
cinch – n. & v. – n. – 1. a certainty; 2. a firm hold; 3. a girth for a saddle or pack; v. – 1. tighten as with a cinch, secure a grip on; 2. make certain; 3. put a girth on a saddle or pack
sinh – n. – Math hyperbolic sine (sinh x = (ex – e-x)/2)