Declined sharply

• Sought pearls, perhaps
• Executed a gainer
• Emulated Louganis
• Jumped into a swimming pool, in a way
• Went under
• Engaged in some flopping
• Emulated Greg Louganis
• Jackknifed, e.g.
• Did a gainer

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Dive \Dive\, v. i. [imp. & p. p. Dived , colloq. Dove , a relic of the AS. strong forms de['a]f, dofen; p. pr. & vb. n. Diving .] [OE. diven, duven, AS. d?fan to sink, v. t., fr. d?fan, v. i.; akin to Icel. d?fa, G. taufen, E. dip, deep, and perh. ...