mess aroundverb trans and intrans

• sink in
• sinking feeling
• sinking fund
• sink one's teeth into something
• sink or swim
• Sino-
• sinologue
• sinology
• Sino-Tibetan
• sinsemilla
• sinter
• sinuate
• sinuous
• sinus
• sinusitis
• sinusoid
• Sion
• Siouan
• Sioux
• sip
• siphon
• siphonophore
• SIPP
• sippet
• sir