a beginning that relaxes a tense or formal atmosphere; "he told jokes as an icebreaker"
a ship with a reinforced bow to break up ice and keep channels open for navigation 同義詞:iceboat,
百科解釋
An icebreaker is a special-purpose ship or boat designed to move and navigate through ice-covered waters. Although the term usually refers to ice-breaking ships, it may also refer to smaller vessels, such as the icebreaking boats that were once used on the canals of the United Kingdom.