| 单词 | to do a porpoise | 
| 释义 | > as lemmasto do a porpoise  a.  slang.  to do a porpoise: (of a submarine) to execute a sharp, near-vertical dive. ΘΚΠ society > travel > travel by water > action or motion of vessel > 			[verb (intransitive)]		 > submerge or travel under water (of submarine) dive1872 submerge1903 crash-dive1928 to do a porpoise1929 snort1953 1929    F. C. Bowen Sea Slang 105  				Porpoise, doing a, said when a submarine dives down nose first at a sharp angle. 1961    F. H. Burgess Dict. Sailing 74  				Doing a porpoise, said of a submarine taking a sharp dive. < as lemmas  | 
	
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