An occasion on which something heaves or is heaved(noun)
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Use "heaving" in a sentence
""That's what we call heaving the log, Miss Garden," said the master, who had been explaining the use of the log, though in not quite so succinct"
""Saturday Night Live" has, since its earliest days, shamelessly flirted with bad taste -- and sometimes taken a wicked delight in heaving itself over the line, rather than just tiptoeing up to it."
"This time I remained aloft, and Wolf Larsen succeeded in heaving to without being swept."